It´s a beautiful morning in July and Nora Linde and her two children go to the beach. During the day's first swim, Nora discovers a body in the water and the Stockholm police is notified. At first it seems to be a drowning accident but Thomas Andreasson, the crime inspector who is investigating the case, soon suspects that it is a murder case. The body is found entangled in a fishing net, Nora manages to figure out whose net it is and contacts Thomas. Nora wants to help the police but knows that her husband Henrik won't approve of it.