The death of Lady Frogmore’s neglectful and disloyal husband should have been a relief. But then her nasty brother-in-law seizes her three children and turns her out, telling the whole of Society that she is a crude, vulgar, loose woman. Without allies or friends, Serafina, Lady Frogmore, turns to Mrs. Dove Lyon, also known as the Black Widow of Whitehall for help, paying her with a promise to grant whatever favor Mrs Dove Lyon asks.

Lord Lancelot Versey has always tried to be a perfect gentleman, and a gentleman honors his debts, even when an unwise wager obliges him to escort a notorious widow into Society. But Lady Frogmore is not what he expects, and helping her becomes a quest worthy of the knight for whom he was named.

Except Mrs. Dove Lyon calls in Seraphina’s promise. The favor she asks might destroy all they have found together.