Lady Katherine Grey has already suffered more than her fair share of tragedy. Newly pregnant, she has incurred the wrath of her formidable cousin, Queen Elizabeth I, who sees her as a rival to her insecure throne.

Alone in her chamber in the Tower, she finds old papers belonging to a kinswoman of hers, Kate Plantagenet, who forty years previously had embarked on a dangerous quest to find what really happened to her cousins, the two young Princes who had last been seen as captives in the Tower.

But time is not on Kate's side - nor on Katherine's either ...