As the thrilling adventures continue for Ursula Blanchard, secret agent for Queen Elizabeth I, she finds herself in France, reunited with her husband, Matthew de la Roche, in a passionate but flawed relationship. But when Ursula learns that her daughter, Meg, has mysteriously disappeared, she immediately sets out on a frantic and dangerous search. The trail leads back to England, to Vetch Castle, a grim, haunted keep owned by the enigmatic Philip Mortimer. Soon Ursula forms an alliance with Mortimer's aging but beautiful mother and finds herself investigating a murder and an elaborate plot that could overthrow the queen's throne.

With surprises on every page and a high-suspense setting, To Ruin a Queen is the best yet from an author whose series continues to gain momentum—and whose heroine becomes more beguiling with each new tale.