A mysterious package from an anonymous artifact donor arrives on the desk of Jill Levin, the senior curator at a Holocaust museum: a secret diary, written by the eldest daughter of St. Thomas More, legal advisor to and close friend of Henry VIII. As Jill and her colleagues work to authenticate this rare find, letters arrive to convey the manuscript's history and the donor's unimaginable story of survival. At the same time, representatives from the Archdiocese of New York arrive to stake their claim to this controversial document, hoping to send it to a Vatican archive before its explosive content becomes public. As the process of authentication hovers between find and fraud, and as the battle for provenance plays out between religious institutions, Jill struggles with her own family history, and her involvement in a relationship she fears will disrupt and disappoint her family. The stories told in the manuscript and letters, however, soon entwine to reveal the secrets that unlock the mysteries of the Tudor court, and the untold history of Jill's own heritage.