The Night Sister.

Norwegian miniseries based on Unni Lindell's mystery novel. An elderly woman is shot and killed in Ullevål Hageby. Witnesses have observed some boys on skateboards at the time the woman was shot. Cato Isaksen and his team are assigned to the case. They discover that the victim's grandchild in Drøbak has been missing for several months. Cato Isaksen is faced with a new and gruesome murder case.