Hide the clue in plain sight.Then prove it was there.

Fair play is a promise you make on page one

Readers of mysteries play along. They want to be fooled, but fairly: every clue the sleuth uses to solve the case must be shown to the reader first, red herrings must have an innocent explanation, and the solution should reread as the only one possible. Break that and the book feels like a cheat, however clever the twist.

The trouble is that the fair-play rule is checked at the end, while clues are planted from the start and revised many times between. A clue moved in the third draft can land after the reveal that depends on it. A detail cut for pace can take a vital clue with it. The longer the book, the more of this lives only in your head.

Authrot keeps the record outside your head. Each chapter is read for the facts and setups it establishes, tied to the exact words, so the evidence trail is something you can look at rather than something you reconstruct.

Clues, red herrings and the reveal, tracked as promises

Every setup a reading finds becomes a promise with a type and a horizon. The type decides how it is kept: a question is answered, a setup used, a clock runs out or is defused, a debt is called in. The horizon says how far it reaches: soon, within its arc, or the long game. The reading suggests both, and you confirm them.

In a mystery, the killer’s identity is the long game, the torn letter is a setup, and the threat to the next victim is a clock. A red herring is still a setup that must be used, only to be explained away. When the reveal chapter comes, open the promises and see what is still open: anything left there is a clue the reader was shown and never got to use.

• Promises grouped as due now, left hanging, and the long game
• Each promise tied to the words that planted it
• A promise can hang on an arc or a thread, and falls due with it

Reveals, and when they land

Mysteries run on unequal knowledge. The killer knows everything, the sleuth learns piece by piece, the reader learns alongside the sleuth, and every other suspect is hiding something of their own. A continuity error in this genre is often a knowledge error: a character mentioning the poison before anyone said it was poison.

Chapter readings record events in order and the state of the world as the chapter leaves it, so when you suspect a slip like that, you can look up the chapter where the poison was named instead of trusting memory. Contradictions are flagged against the earlier fact they break, with a suggested fix you can review. Story time keeps the night of the murder straight even when you tell it out of order: a flashback sees the right past, kept apart from what the reader has already read.

Fair play also means keeping the guilty party in view. A culprit who vanishes for ten chapters and reappears for the confrontation feels like a trick. Screen time shows every suspect’s presence down the manuscript, and characters who have gone quiet too long are flagged as due back, so you can give the killer an innocent scene in the middle of the book on purpose.

The cozy mystery starter and the four movements

The Cozy mystery starter fills open Voice fields with the shelf’s conventions: first person, the sleuth only; light and warm, with the puzzle taken seriously; play fair, three or four suspects each with a secret, the murder off the page. It sets the boundaries most cozy readers expect (no gore, no on-page sex, little swearing) and suggests the first book of a series. Subgenres include paranormal, culinary and village mysteries.

It then offers the mystery structure, four movements laid out as arcs. The crime: normal life, the body, taking the case. The investigation: the suspects, a first theory, a second crime that breaks it. The twist: danger, and the early clue seen anew. The reveal: the confrontation and order restored. If you prefer to plan backwards from the solution, the seven-point structure starts from the ending and builds the turns that lead there.

A village readers come back to

Cozy and crime series live on their recurring cast: the nosy neighbour, the patient detective sergeant, the café that is somehow at the centre of every case. A project holds the whole series, and the bible spans it, so the sergeant’s first name, the neighbour’s cat and the café’s opening hours stay the same in book six as in book one.

Connections shows who is related to whom, who used to date whom, and which ties hold at any chapter, which is exactly what you need when book four’s victim turns out to be someone’s cousin. The Chatty sleuth voice template, a funny, nosy narrator who notices the one thing that’s off, is there to tune your sleuth’s voice by ear.

Revising the solution without breaking the trail

Most mysteries are solved twice: once by the writer in the first draft, and again in revision, when the culprit, the motive or the order of discoveries changes. Every change to the solution ripples backwards through the clues. The safest way to revise is to keep the record current as you go. Switch on automatic reading and a chapter is read again after you stop typing, so the setups and facts follow the draft rather than the plan you had last month.

If a suspect is renamed, rename the entry across the whole text with a preview and undo. If two entries turn out to be the same person (the stranger in the lane was the vicar all along), merge them, and every reference, fact and tie moves to the one that remains. History keeps every version of every chapter, so a clue you cut in draft three can be found and restored in draft five.