And what they don’t want you to know, you definitely want to know. - Ben Aaronovitch

She had the startled rabbit look that civilians get after five minutes of helping the police with their inquiries. If they stay calm for too long it’s a sign that they’re professional villains or foreign or just plain stupid. All of which can get you locked up if you’re not careful. If you find yourself talking to the police, my advice is to stay calm but look guilty; it’s your safest bet.

Technically, you don't have to have a corpse to convict for murder but detectives always feel better when they've found your actual victim—they're superstitious like that.

The ABC of policing literally goes: Assume nothing, Believe no-one, Check everything.