As the computer Deep Thought pointed out in The Hitchhiker’s Guide to the Galaxy, it’s no good spending seven and a half million years working on the answer if you don’t start with a good idea of what the question is. Lacey’s second novel, the follow-up to 2015’s Nobody Is Ever Missing, opens with a full-scale assault on readerly curiosity: a female narrator wakes up in her own bed and then locks eyes, shockingly, with a woman called Ashley who is outside her window, staring in. The who, what and why are a powerful incentive to drive through the pages. But for the characters in The Answers, the thing they are looking for is always being deferred or displaced.