In 1520, the notorious and power-hungry Danish King Christian II is determined to seize the Swedish crown from Sten Sture, no matter what it takes. Meanwhile, sisters Freja and Anne make a solemn promise to seek revenge on the men who brutally murdered their family. Everything comes to a head in the heart of Stockholm, where the sisters are drawn into a ruthless political struggle between Sweden and Denmark that culminates in a mass execution, presided over by the mad King "Christian the Tyrant," known as the Stockholm Bloodbath.

　　讲述一对性格迥异的同父异母兄弟——哥哥是行事冲动的侦探，弟弟是纪律严明的海军海豹突击队员——因父亲在夏威夷遇害而被迫联手，踏上一场危机四伏的追寻之路，誓要揭开背后隐藏的惊天阴谋。