1402. Queen Margrete successfully rules Sweden, Norway and Denmark together into a peaceful union. However as a woman, she is forbidden from the throne, so governs indirectly through her adopted son, King Erik. The alliance is precarious and when a mysterious man presents himself at the palace, professing to be Margrete's long-dead biological son (and thus laying claim to the throne) she's faced with an impossible dilemma, one that threatens everything she's worked for.