故事改编自真实事件，故事讲述一群心怀不满的少女，她们厌倦了在斯德哥尔摩富裕郊区 Djursholm 的优越生活，并参与了针对她们天真的富裕邻居的入室盗窃活动。白天，她们是成绩优异的学生和女儿，但到了晚上，她们就变成了冷酷无情的小偷。

　　In the fourth season, a woman is found brutally murdered on a small artificial Danish island close to the Øresund Bridge. The woman is Margrethe Thormod, Thormod, Director General of the Migration Agency in Copenhagen, who was recently embroiled in a deportation scandal. Danish detective Henrik begins to investigate the murder without the involvement of Saga, due to the fact that she has now been imprisoned for the murder of her mother. Henrik is missing his colleague and wants to visit her as often as possible so she can help with the case. However, her predicament renders her unable to help. Henrik’s search for his missing daughters is also frustrated by Saga’s imprisonment and he gets close to giving up.

　　When a well-known gender theorist, and owner of Copenhagen's first gender-neutral preschool, is found murdered at a construction site in Malmö, Saga has to cooperate with a new Danish colleague, Hanne, who has difficulty accepting Saga.