Guide
Detective tiers
Every case carries a difficulty stamp named after Conan Doyle's characters, from Watson to Holmes. Start where you like; the stamp tells you what kind of night you are in for.
Watson
A clean case. Read carefully.
20 minutes on the clock
A clean case and the place to start. The trail is straight and every clue you need is on the floor: read every card and the contradiction shows itself.
Moriarty
Red herrings. One lie that matters.
40 minutes on the clock
Red herrings, and one witness lies about something that matters. Check each statement against the timeline, the logs and the receipts before you trust it.
Holmes
Everyone is hiding something. Only the best get this one.
60 minutes on the clock
Everyone is hiding something. More suspects, more evidence arriving while you work, and lies that only fall apart against each other. Only the best close these.