The Man in the Queue - Josephine Tey

Murder in a crowded public place and no one saw a thing... A man slowly sinks to the ground standing in line to obtain a ticket to a stage musical. And he has a silver dagger neatly plunged into his back. But how was he stabbed when no one around him witnessed the crime? With the wit and guile that have made Inspector Grant a favourite of crime buffs, the inspector sets about discovering just how a murder occurred among so many witnesses, none of whom saw a thing. The Man in the Queue (aka Killer in the Crowd) is the first of the author's novels starring the popular Inspector Alan Grant.