By the time young Catherine Parr (Michelle Williams) married the deteriorating, increasingly despotic King Henry VIII (Jude Law), she had no assurances of a happy marriage; in fact, she had no assurances of surviving this marriage at all. Of her predecessors, two were thrown out, one died in childbirth and two were beheaded. While Catherine tried to keep her head about her to navigate the politics of her position, she brought a secret agenda. She was Protestant, believed it her duty to marry Henry, for it would be the only position in which she could convert him – and the kingdom – from his pro-Catholic position. That faith was tested when the church resisted granting his divorce from his first wife so he could marry Anne Boleyn, who would later be beheaded. With arrests, torture, and executions of Protestants on the rise, Catherine invited a dangerous game that would leave one of them dead before long. The thriller is told through Catherine's singular point-of-view of the psychological horror of living with a monster—and the remarkable will to not only survive, but thrive.