Silent Evidence: a noir detective game of fair-play murder cases

The test worth applying is whether the game lets you be wrong. If a narrator narrows the suspects for you, or the story advances no matter what you pick, you are reading a mystery rather than solving one. Look for a single correct answer, evidence given in full, and an accusation specific enough to fail. Silent Evidence works that way: ten fictional cases, a three-part verdict naming culprit, motive and method, and partial credit when you get only part of it. It is free on iPhone and Android.

Fair play means the reader is given everything needed to reach the solution before it is revealed. The idea was formalised in Golden Age crime fiction, notably by Ronald Knox and the Detection Club, and ruled out cheats like an unknown identical twin, an invented poison, or a culprit introduced on the last page. Misdirection is still allowed — the key detail can sit in plain sight — but nothing essential may be withheld. A fair puzzle can be reasoned out early; an unfair one can only be waited out.

A red herring is a detail planted to look incriminating and pull you off the trail — a debt, a threat overheard, a lie about something unrelated. Two habits catch most of them. First, ask what the detail proves rather than what it suggests: a lie about an affair is a lie about an affair, not about a killing. Second, test it against independent evidence such as a timestamp, a ledger entry or a phone record. In a fair-play mystery, whatever clears a red herring is also in the file.

A locked-room mystery is a killing in a place nobody could have entered or left — a bolted study, a library sealed from the inside, snow with no footprints. It is the genre's oldest set piece, going back to Poe's Rue Morgue and later refined by John Dickson Carr. The solution almost never involves a secret passage. It usually turns on an assumption you accepted without checking: when the death actually happened, or whether the room was really sealed at the moment everyone believes it was.

It is the standard frame for testing a suspect. Means asks whether they could physically have done it — access to the weapon, the strength or the knowledge required. Motive asks why they would: money, fear of exposure, revenge, protecting someone else. Opportunity asks whether they were in a position to do it at the time it happened. A suspect who fails any one of the three usually drops out, which is how a roster of five or six narrows to one.

Broadly three kinds. Physical and forensic evidence: the scene itself, photographs, and the coroner's or autopsy report establishing cause and approximate time of death. Documentary evidence: telephone logs, financial records, ledgers, letters and press coverage, which are useful because they were created for other reasons and are hard to fake after the fact. And testimony: what suspects and witnesses say, which is the least reliable and the most interesting, because it can be checked against the other two. Silent Evidence builds its case files from all three.

The app is free to download and the first case file is free to open and solve start to finish. Every case after that opens its first clues for you to examine. Silent Evidence Pro, listed at $9.99 in the App Store, unlocks all ten cases and every case added later, plus full-length recordings, complete suspect dossiers and exhibit photographs, and hints without watching ads. The free tier shows ads between cases; Pro removes them. Restore Purchases is on the paywall screen.

No account and no sign-up. You open the app and start reading the first case immediately — there is no wall between you and the file. Progress, badges and best scores are stored on your device, so you can put a case down half-read and pick it back up exactly where you left it. Cases are self-contained, with no timers and no live opponents. Silent Evidence is available on iPhone and Android.

Hints are tiered rather than all-or-nothing. A first nudge is always free, and deeper hints are unlocked either by watching a short ad or by having Silent Evidence Pro, which lifts the hint limit without ads. Hints do cost you something, though: each case is scored, and a clean close with no hints and no wrong guesses is worth more than one you needed help with. There are no timers, so leaving a file open and coming back to it later is usually the better move.

It is rated 12+, and the subject matter is what that rating implies: every case is a murder investigation, described through coroner's reports, forensics and interrogation transcripts rather than depicted action. The tone is noir and procedural — you are reading a case file, not watching a crime. Every case, victim and suspect is entirely fictional, written for the game and not based on real people or real events. For younger children, or anyone who would rather not read around a death, this is not the right game.