Guilty by Deduction – Can You Really Publish Murdle-Style Whodunit Books Without Writing a Single Clue?

Logic-grid mystery books have become one of the most talked-about corners of the puzzle market. Readers love the feeling of naming the culprit themselves, and illustrated “whodunit” casebooks keep showing up in the Amazon bestseller lists. The tricky part for publishers has always been the puzzle design: every case needs exactly one solution, and building that by hand is slow, fiddly work.

Guilty by Deduction handles that part for you. I used it to build a full casebook for KDP and a printable pack for Etsy, so in this review I’ll show you how Guilty by Deduction works, what’s inside, what the two upgrades add and whether it’s worth the price.

What Is Guilty by Deduction? How Does It Work Step By Step?

Guilty by Deduction is a browser-based builder for illustrated whodunit logic-grid puzzle books. Each case gives the reader three suspects, three items and three locations on illustrated cards, a set of numbered clues and a yes/no deduction grid, with the full answer key at the back. You can build books of up to 200 cases in murder, theft or mixed modes, then export a print-ready PDF for Amazon KDP or 300 DPI PNG pages for Etsy.

Here’s the step-by-step flow as I worked through it:

➤ Step 1 — Set up your book. Choose a trim size (8.5 x 11, 8 x 10 or 6 x 9), then enter the title, author name and imprint. You can save these details as a profile and reuse them for every book in a series.

➤ Step 2 — Choose your cases. Pick the crime type, difficulty and number of cases. You can hand-make a few favourite cases and let the builder fill in the rest.

➤ Step 3 — Export and sell. Download a print-ready PDF for KDP or a zip of 300 DPI PNG pages for Etsy, add your cover and upload. Every export is saved to My Books so you can regenerate it later.

About The Creator

Guilty by Deduction was created by Kate Anderson and the team at Puzzle Arsenal, a brand of puzzle-book builders run by people who publish and sell their own puzzle books. Puzzle Arsenal sits alongside the Niche Raiders family of publishing tools, which has a strong following among low-content and KDP publishers.

This launch also brings two sister builders, Connection Quest and The Elimination Game, which shows how focused the team is on giving publishers a full shelf of puzzle formats rather than a single one-off tool.

The care in the build is obvious. Every case is checked to have exactly one solution, the builder rechecks a case after you edit it, and the books include a proper How to Solve guide. That’s the work of creators who clearly know what puzzle readers expect, and it made me confident putting my own imprint on the books.

Guilty by Deduction Review — Key Features

✅ Illustrated case files: Each case is laid out as a two-page spread with suspect portraits, item cards and room illustrations. The art makes the book feel like a premium casebook rather than a plain grid, which helps it stand out in thumbnails and in readers’ hands.

✅ Three crime modes: Build books of murder cases, theft cases or a mix of both. A theft-only book suits younger readers and gift buyers, while murder or mixed books suit adult puzzle fans.

✅ Four difficulty settings: Choose Easy, Medium, Hard or Progressive, which starts gentle and builds to Hard across the book. Progressive is ideal for “beginner to detective” titles that keep readers turning pages.

✅ One verified solution per case: Every case is checked to have exactly one answer, and the builder rechecks it whenever you change a name or swap a suspect. That protects you from the one-star review every puzzle publisher fears.

✅ Fully editable cases: Rename cases, houses and victims, rewrite the intros or swap suspects, and the clues and solution update to match. You can give every book its own world, from a seaside hotel to a 1920s manor.

✅ Indirect clues: Some clues describe a card rather than naming it, such as “the person holding something sharp”, so readers must study the illustrations. It adds a satisfying layer that makes the puzzles feel crafted.

✅ Built-in reader aids: Every book includes a two-page How to Solve guide with a worked example, plus an optional solved Case Zero. New solvers can start right away, which keeps reviews positive.

✅ Three trim sizes and up to 200 cases: Export at 8.5 x 11, 8 x 10 or 6 x 9, from a short book up to 200 cases. A 25-case book runs about 84 pages at 8.5 x 11, a comfortable size for KDP paperbacks.

✅ KDP and Etsy exports: Download a print-ready PDF for KDP or a zip of 300 DPI PNG pages for Etsy printables. My Books stores every export so you can regenerate the exact same file whenever you need it.

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Every book you build comes with these finished pages ready to go:

• Title & Copyright Pages: generated with your title, author name and imprint.
• How to Solve Guide: a two-page walkthrough with a worked example.
• Case Zero: an optional solved starter case for new readers.
• Full Answer Key: solutions for every case at the back of the book.
• My Books Library: storage for every export so you can rebuild files anytime.

Guilty by Deduction Pricing & Funnel Summary

Guilty by Deduction Front End ($27)

The front end is $27, a one-time payment with no subscription, and the launch runs from November 9 to November 13. It includes builder access in your Puzzle Arsenal account, all three crime modes, four difficulty settings, books up to 200 cases, three trim sizes, PDF and PNG exports, My Books storage and a licence to sell the books you create.

Is It Worth Buying?

For KDP and Etsy puzzle publishers, I’d say yes without much hesitation. Designing even ten logic-grid cases with exactly one solution by hand can take days, and here a full illustrated book is ready in an evening. One thing to keep in mind: the builder creates the interior, so you’ll add your own cover, which took me about half an hour in Canva per book.

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The Upsells:

➡️ OTO 1 — Connection Quest ($37): A train-track puzzle builder with four themes, Railway, Circuit Path, Pipe Works and Construction Site, and unlimited books. Readers connect the route from start to finish, a format that works brilliantly for children’s activity books and relaxing adult puzzle collections. It is ideal for publishers who want a second, completely different puzzle line on their shelf.

➡️ OTO 2 — The Elimination Game ($37): A “find the killer” elimination puzzle builder with two Evidence Checks per case and unlimited books. Readers rule suspects out step by step, which pairs perfectly with your Guilty by Deduction casebooks as a companion series. It suits mystery-puzzle publishers who want to build a branded detective range.

Why Should You Choose Guilty by Deduction?

My Personal Experience With Guilty by Deduction

I got early review access before launch and used it to build a 30-case puzzle book called “The Blackwood Manor Casebook”, an 8.5 x 11 paperback for adult puzzle fans set across one stormy weekend at a country house. I also exported a 10-case Etsy printable from the same project.

Here’s how I laid out the casebook:

• Front Pages: title and copyright pages under my imprint, the two-page How to Solve guide and a solved Case Zero called “The Missing Teaspoon”.
• Cases 1–8 — Friday Arrivals: Easy theft cases such as “The Vanishing Locket” and “The Wine Cellar Key”, using the theft mode and renamed rooms like the Orangery and the Map Room.
• Cases 9–18 — Saturday Storm: Medium mixed cases, including the first murder, “Death in the Library”, with rewritten intros that tie each case to the weekend story.
• Cases 19–26 — Sunday Secrets: Hard murder cases with indirect clues pointing at card details, like “the guest holding something from the garden”.
• Cases 27–30 — The Final Reckoning: four Hard cases I hand-made first, then let the builder verify, so the book ends on my own favourite puzzles.
• Answer Key: full solutions for all 30 cases, plus a simple Canva cover with a manor at night.
• Etsy Pack: cases 1–10 exported as 300 DPI PNG pages for a printable family game-night pack.

The interior took me one evening, plus about an hour to rewrite intros and rename rooms so the book had its own world. My hand changes were the normal finishing touches: a custom cover, a back-cover blurb and a tidy subtitle. The rechecking after each rename meant I never had to worry about breaking a case.

I priced the paperback at $9.99 and the Etsy pack at $4.50. So far the book has sold 118 paperbacks and the printable 96 copies, bringing in approximately $960 in royalties and sales. While those numbers aren’t life-changing, they came from one evening’s build, and a second volume is already in progress.

Who Should Use Guilty by Deduction?

• KDP low-content publishers: build illustrated whodunit casebooks of up to 200 cases and publish a print-ready PDF the same day.
• Etsy printable sellers: export 300 DPI PNG pages as family game-night or classroom puzzle packs.
• Mystery and puzzle fans: create a personalised casebook as a gift with friends’ names as suspects.
• Teachers and tutors: use Easy theft cases to teach logical reasoning in a fun format.
• Puzzle-book series builders: use profiles and Progressive difficulty to launch numbered volumes.
• Party and event hosts: print a few cases for murder-mystery evenings or team-building games.

Common Questions About Guilty by Deduction

• Is it a one-time payment?
  Yes, $27 once with no subscription.
• Can I sell the books I make?
  Yes, on KDP, Etsy and elsewhere. The builder itself is for your own use.
• Does it make covers?
  It builds the full interior; you add your own cover.
• How many cases can a book have?
  Up to 200. A 25-case book is about 84 pages at 8.5 x 11.
• Can I edit the cases?
  Yes. Rename, rewrite or swap suspects and the builder rechecks the solution.

Comparison Table: Guilty by Deduction vs. Alternatives

Feature	Guilty by Deduction	Generic Logic-Grid Generators	Designing by Hand
Illustrated suspect cards	Yes	Text grids only	Needs an illustrator
One verified solution	Every case	Usually	Manual checking
KDP PDF + Etsy PNG	Both	Often one	Manual layout
Cost	$27 once	$15–$30/month	Days of work

Pros and Cons of Guilty by Deduction

• ✅ Illustrated case spreads that look like a premium casebook.
• ✅ Every case verified to have exactly one solution, even after edits.
• ✅ Murder, theft and mixed modes with four difficulty settings.
• ✅ KDP PDF and Etsy 300 DPI PNG exports from the same build.
• ✅ One-time $27 payment with a licence to sell your books.
• ⚠️ Covers are your own touch; a simple Canva cover takes about half an hour.
• ⚠️ If you’d like more puzzle formats on your shelf, Connection Quest and The Elimination Game cover that nicely.

Final Verdict on Guilty by Deduction

Guilty by Deduction makes it genuinely easy to publish illustrated whodunit puzzle books that look professional and play fair. For KDP and Etsy puzzle publishers, teachers and mystery fans, the $27 front end is a solid, low-risk way into one of the most popular puzzle formats around. If you want a branded detective range, pairing it with The Elimination Game is the natural next step. Either way, it’s worth considering while the launch runs through November 13.

That’s all what I want to share with you about Guilty by Deduction. I hope that my review can give you a helping hand in deciding what is best for you.

Important Reminder: When you purchase this product through my special link, you’ll unlock exclusive, valuable bonuses that you won’t find anywhere else! (Please note: these bonuses are only available with the full purchase-not with trial or free versions.)

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