Lily Thornton, daughter of the Duke of Breckenridge, unwittingly finds herself a suspect in a rash of jewelry thefts. In order to clear her name, she teams up with her best friend Emily's brother, the handsome Colin Dymoke, to find the real thief. To make matters worse, Lily's scheming former fiance keeps turning up and causing trouble while making Lily question her own self-worth. Thankfully, she has Colin by her side to help and protect her. As they work to solve the mystery, Lily fights her growing feelings for Colin, who is considered one of England's most eligible bachelors. Having been hurt in the past, she's reluctant to entrust her heart to someone again. Before long, the two of them are caught up in a web of intrique and deception. They need to clear Lily's name before she and her family are ruined and all hope for romance with Colin is lost.