Parting ways with ex-detective Daniel Hawthorne, sleuth and author Anthony Horowitz turns his attention to the premiere of his new play in London's West End. Sunday Times critic Margaret Throsby gives it a savage review, and then the next day, she is found stabbed to death—by Anthony's dagger. Arrested by his old enemy, Detective Inspector Cara Grunshaw, Anthony needs help from Hawthorne, or this fourth case—after A Line to Kill—will surely be his last.