The Hard Case Files — Advanced Detective Mysteries
32 original fair-play detective investigations for adults, older teens and experienced puzzle solvers who want the evidence to do the work.
One-time digital purchase · PDF · No subscription
Adults, older teens and experienced puzzle solvers who enjoy deduction, timelines, routes, records, witness statements and multi-step reasoning.
What makes it differentDetective investigation first, reasoning mechanic underneath. The difficulty comes from connecting supplied evidence — not specialist trivia or hidden outside facts.
Fixed-layout PDF designed for tablet viewing and personal printing. Some investigations are easiest to work through with pencil and paper or by printing the workspace pages.
Paperback edition planned for supported Amazon KDP marketplaces after physical-proof QA. It is not yet offered through Dishantra.
After successful payment, Dishantra provides protected access to the digital edition. Save your personal copy after downloading.
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Inside the casebook
20 detective-deduction investigations
Timelines, routes, witness statements, access logs, custody records and linked constraints.
8 different reasoning mechanics
Fresh evidence structures that reduce the feeling of solving the same grid repeatedly.
4 deeper multi-stage investigations
Multiple exhibits and linked deductions where an intermediate conclusion matters before the final answer.
Look inside before you choose
Real pages from the final digital edition. Samples demonstrate the case-file, workspace and solution approach without reproducing the acquisition article’s teaching example.
View a case-file page
View an investigator workspace
View a premium dossier page
View the solution style
What you are buying
- 197-page digital edition: cover + 196-page casebook interior
- 32 original fair-play investigations
- Exactly three progressive hints for every case
- Full reasoning walkthrough for every case
- Structured workspaces plus free-note pages
- Navigation bookmarks for digital use
- Personal-use licence
This is an entertainment and reasoning-practice product. It is not professional advice. Please independently review any real-world decisions outside the fictional casebook.