Spring 1797. The war with France deepens, the Channel Fleet has mutinied . . . and a ruthless traitor lurks within fashionable London society.

Such matters should not concern young Mary Finch, who has recently inherited an unexpected fortune. But her new status brings her little pleasure, and she longs for freedom and adventure.

Mary's restless spirit leads her to a meeting with an elusive spymaster, who offers her an intriguing proposal. With England's security and a friend's safety at risk, Mary arrives at the exotic Champian Hall, determined to uncover its dark secrets. But the knowledge that she seeks is deadly, especially when the hunter becomes the hunted.

Brimming with suspense and drama, The Counterfeit Guest is an irresistible historical mystery from the author of the acclaimed The Blackstone Key.