After author Mia finds love with single father Emil, their happiness is put to the test as they undergo fertility treatments to have kids of their own.

Martin's daughter, Emma, takes up a night watch job to find out what happened to her parents almost thirty years ago. A meeting with Wörmer in his cell pulls the serial killer out of his coma and sets in motion a chain of fateful events.

Detective Laura has been on sick leave after suffering from postpartum depression, but when she and her partner become involved in a case, it becomes increasingly clear that she herself is hiding a dark secret.