Crime Fiction · Thriller

Your detective knows too much. Your reader too little.

When you write crime fiction, every clue, every alibi, and everything your detective knows must hold up across the entire manuscript. Vellam checks whether you planted clues before the solution, whether alibis are consistent across chapters, and whether your detective knows things they couldn't possibly know yet.

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Vittore Carpaccio, The Vision of Saint Augustine, 1502
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What you get

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01 · Key for crime fiction

No clue is left unresolved

A clue appears in chapter 18 and the detective uses it in chapter 22. Vellam checks every clue and every deduction: was the evidence available to the reader before the detective used it, and did the clues you planted get resolved?

02 · Key for crime fiction

The alibis hold and your detective never knows too much

A suspect was in Krakow in chapter 4. In chapter 11 they commit a scene in Warsaw at the same time. The detective reasons from a lab report in chapter 9, but only receives it in chapter 14. Vellam catches both types of error before they reach your beta readers.

Story Atlas

Who is a suspect, where they were, what they knew

Vellam builds a profile for every character and key event based on what you wrote. No setup required. You see motive, alibi, relationships, and each character's knowledge state in every chapter.

  • Automatic detection of characters and suspects
  • Alibi and location in every chapter
  • Detective's knowledge state step by step
  • Consistency flags: when investigation logic breaks down
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Investigation Protocol

From the first clue to the final chapter. Vellam tracks every step.

  1. Evidence chain

    Vellam maps every clue from the moment it appears in the text to the moment the detective uses it. You see which clues are unresolved, which appear too late, and which are never summarized.

  2. Dead ends

    Every false lead you introduce must be explained before the crime novel ends. A reader who followed a suspicion about Agnieszka for eight chapters deserves to know why they were wrong. Vellam checks that every dead end has a resolution.

  3. Character knowledge over time

    Who knew what, and when. Vellam tracks every character's knowledge state chapter by chapter and flags moments when someone acts on information they couldn't yet have. The most common reader complaint in crime fiction: "how did they know that?"

Chapter 14 of 26
Characters Komisarz Kowalski Detective · 47 · Criminal division
Knowledge this chapter Knows autopsy results, testimony of 3 witnesses, location of the lighter
Unresolved threads Nowak's motive unclearAgnieszka's alibi unverified
Characters Tomasz Nowak Suspect · 38 · Businessman
Status this chapter Alibi challenged, motive established in ch. 7
Inconsistencies Location contradicts ch. 9
Suspects Agnieszka Wisniewska suspect · ch. 3-14 · motive: jealousy
Alibi Claims to have been at the theatre. Unverified.
Dead end Suspicion active from ch. 3, unresolved in the text
Timeline active Crime timeline thread
Key event Crime: Friday, 15 March, approx. 22:00 (established in ch. 2)
Timeline inconsistency Nowak: Krakow 17:30 (ch. 14) vs. Warsaw 16:00 (ch. 9)
On the horizon

Vellam grows with your investigation.

We are building the features crime writers need most.

Fair play audit

Coming soon

Did your reader have a fair chance to solve the mystery alongside the detective? Vellam maps every deduction to a specific earlier clue and evaluates whether your crime novel plays fair.

Dead-end tracker

Coming soon

Every false lead you plant must be explained. Vellam tracks all red herrings through the manuscript and shows which ones disappear without resolution.

Character knowledge map

Coming soon

A per-chapter map of what every character knows at any given moment. No more detectives stepping on evidence they couldn't possibly know about yet.

Motive verification

Coming soon

The killer's motive must be in the text before it is revealed. Vellam checks that every suspect has an established motive earlier than their exposure, not just in the epilogue.

Crime timeline

Coming soon

Auto-generated reconstruction of key events from your manuscript. Immediately see if anything is logistically impossible: distances, times, alibis.

Procedural analysis

Coming soon

Crime readers know procedure. Vellam compares police, prosecutor, and forensic actions in your text against actual legal standards and flags where procedure breaks down.

Missing a feature you need? Submit an idea

Credits and payment

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We know how it goes elsewhere. You buy a pack, forget about it for three weeks, come back and it's gone. We do it differently.

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From writers

What users say

Gustave Doré, Don Quixote, 1863

A fascinating tool, recommended to me by a colleague in the industry. It delivers deeply considered feedback with a handy breakdown by chapters and areas of work. I recommend it to the authors I collaborate with as their first beta reader, and to editors as a supporting tool that generates ideas.

Paweł Editor, recommends Vellam to authors In an editor's work A first read for the authors he works with.

Reviews come from Vellam users who agreed to their publication. Some have been translated from the original language.

Pricing

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What credits pay for

One credit balance works across almost the whole app. You never buy analysis and chat separately: every feature takes what it uses from the same balance.

  • Chapter and full-book analysis
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From the blog

Craft guides for this genre

Audit your plot before your reader does.

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