Lady Rose Summer's debut into high society is a complete disaster. Rose's father suspects her fiancé Sir Geoffrey Blandon to be nothing more than a first-degree blackguard and calls on Captain Harry Cathcart, the impoverished younger son of a baron, to investigate. After Harry brings forth evidence of Blandon's dishonorable intentions, a scandalous public breakup follows. To redeem her name, Rose attends the last-chance soirée at Telby Castle for aristocratic women with dubious matrimonial prospects. But when a malicious guest is found dead under strange circumstances, Rose becomes far more intrigued with discovering the truth than with landing a suitor. From Telby Castle's whisper-filled corridors to country lanes with secrets at every turn, Harry and Rose must unravel a web of lies, rumors, and perilous plots as a clever murderer sets out to make Rose's disastrous season her last.