We Solve Murders (We Solve Murders, #1)

by Richard Osman

Amy once told Steve that the first time she enters any building she looks for every possible escape route. Steve used to do it himself, but, as he’s got older, the first thing he looks for is where the loo might be.

“And how did she score on your Psychopath Test?” “Ninety-six,” says Jeff. “Same as me. That’s why she’s head of HR.”