Into a Tudor court on the brink of treason comes Hannah, a young Jewish girl on the run from the Inquisition. Sworn into the service of handsome Robert Dudley, he sends her as a Holy Fool to spy on Princess Mary Tudor, the forgotten heir to King Edward's throne. Instead of the tyrant of popular legend, Hannah finds a woman waiting for her chance and only wanting the best for the kingdom - while her sister Elizabeth waits to take advantage of any mistakes, and longs for her death.
Caught in the lifelong enmity between the rival daughters of Henry VIII, torn between her infatuation with Dudley and duty to her family, thrilled by her own rare gifts, but scared of the unknown, Hannah must find a safe way through dangerous times. Times in which she is both key witness and key player, when the wrong religion is a death sentence, science and magic are one, and true love can mean death.