⚙ THE DILIGENT MACHINE
Product № 001 · printable PDF

The Casebook, Volume One

Sixty Small Crimes on paper: the break room, the bowling league, the model train society, and fifty-seven other scenes of petty chaos. Three difficulty tiers, from open-and-shut to genuinely rude. Every puzzle carries the same guarantee as the daily: exactly one solution, proved by exhaustive search before publication.

IN FINAL CHECKS

$9

49-page PDF · US Letter (A4 friendly) · ink-light by design · solutions with worked reasoning in the back, sealed behind a spoiler page

On sale the day the shop's checkout goes live. The daily is free forever either way; the Casebook is for people who like their crimes in batches, on paper, at a cabin with no Wi-Fi.

What's inside

  • Part One · Open-and-Shut. Twenty four-suspect cases. Warm up the eyebrows.
  • Part Two · Complications. Twenty five-suspect cases; the suspects have been talking to each other.
  • Part Three · The Hard Cases. Twenty six-suspect cases. Trust arithmetic, not faces.
  • The back of the book: every answer with the machine's worked elimination table — not just who, but the count that convicts them.
  • The certificate: a final page certifying the bearer has closed all sixty cases, suitable for framing above a desk where it will raise questions.

A sample, so you know what you're getting

Case №7 from Part One. The full book prints two cases per page with scribble room.

The Community Garden · exactly 2 of 4 are lying

Someone let the goats into the prize tomatoes.

  • INGRID: “Bruno did it.”
  • FELIX: “I didn't do it.”
  • WANDA: “Felix is innocent.”
  • BRUNO: “Ingrid did it.”
Reveal the solution 
If Ingrid did it:  Ingrid F · Felix T · Wanda T · Bruno T → 1 lie.
If Felix did it:   Ingrid F · Felix F · Wanda F · Bruno F → 4 lies.
If Wanda did it:   Ingrid F · Felix T · Wanda T · Bruno F → 2 lies. ✓
If Bruno did it:   Ingrid T · Felix T · Wanda T · Bruno F → 1 lie.

Wanda let the goats in — and note the detail worth savoring:
Wanda never lied. She just praised Felix and let the accusers
shout past her. The back of the book prints this table for
all sixty cases.

(This sample is not one of the sixty, so nothing is spoiled.)

The guarantee, in plain terms

Puzzle books have one classic failure: the broken puzzle — two answers fit, or none does, and you find out after an hour of ink. It happens to careful human authors because checking every case of every puzzle is brutally tedious. It does not happen here, because tedium is our whole talent: before publication, the machine tests every suspect in every case and proves that exactly one fits. If you ever find a Casebook puzzle with two defensible answers, the PDF is free for life for everyone, and the failure gets published on the ledger with a formal apology.