Interrogation techniques that actually work in a case file

Budget your questions before you spend them

In Nightfile your questions are limited, which mirrors real interviews: attention is the scarce resource. Decide what you need to learn before you open a suspect's file, and write the question in your head first.

A good rule: never ask a question whose answer would not change your shortlist. If both a yes and a no leave your ranking identical, the question is decoration.

Open wide, then close fast

Your first question to a suspect should be broad enough that they have to build a narrative — that narrative is raw material. Your second should attack one specific detail inside it.

This is the funnel: a liar must keep the whole story consistent, and every new detail they invent is another surface you can press.

Use the other suspects as instruments

The strongest evidence you can get is not a confession, it is a contradiction. Take a concrete claim from one suspect and hand it to another as a question.

When two accounts disagree about something physical — a door, a time, a light being on — at least one of them is lying, and you have just cut your shortlist in half.

Watch the shape of the answer, not the tone

Nervousness is not guilt. In a written case file, focus on structure: over-explanation, unrequested alibis, and precision about irrelevant details while staying vague on the crucial window.

Innocent people are usually imprecise everywhere. Guilty ones are suspiciously precise exactly where it matters.

Close the loop before you accuse

Once you have a suspect, spend one last question letting them explain the contradiction. If they can dissolve it cleanly, you saved yourself a wrong accusation. If they cannot, you can name them with confidence.