When Gay Hardwicke's cousin Sylvia begs for her help, Gay finds herself drawn into a tangled web of blackmail and mystery. Sylvia's husband, the wealthy Sir Francis Colesborough, forbids her from playing cards — but Sylvia has lost a fortune and is being blackmailed by the enigmatic "Mr. Zero."

As Gay tries to unravel the mystery and protect her cousin, a sudden murder throws everyone under suspicion. With the police closing in and the stakes rising, Gay must use all her wits to unmask the killer before it's too late.

Patricia Wentworth, master of the classic British mystery, weaves a tale of secrets, betrayal, and danger that will keep you guessing until the very end. Join Gay on a thrilling quest for the truth in this page-turning Golden Age detective novel.