When wealthy heiress Miss Lindsey Crompton sneaks into the house of the Earl of Mansfield – a known cad and wicked scoundrel – she simply wants to investigate his involvement in some recent murders. But when Thane catches her he blackmails her into a betrothal.

However, underneath his wicked exterior, the Earl has a secret – he is tracking a killer who may be one of Miss Crompton’s suitors.