In 1561, with Elizabeth I on the throne and Catholic plots brewing, a young German prince arrives in England claiming to be the rightful heir – the son of Henry VIII and Anne of Cleves.

Armed with jewels, letters, and Tudor looks, his claim threatens to upend the dynasty. But as poison spreads and secrets unravel, astrologer John Dee and his companion Margaretta must uncover the truth behind the prince’s origins. Their investigation spans England and Germany, revealing forbidden love, betrayal, and a dangerous plot with ties to the throne. Will they uncover the truth in time to save the queen?