It's autumn in Gothenburg. An anxious mother calls the police; it seems her little boy was lured into a car by a man offering sweets then returned unharmed. The same happens with a little girl, and then another. As each child attends a different day nursery, and each parent contacts a different police station, no connection is established between the incidents. The reports are filed and forgotten. At police headquarters, DCI Erik Winter is investigating a series of random GBH attacks on university students. There are no witnesses, and the victims are less than cooperative. Who or what are they trying to hide? Winter has an additional case to solve when a four-year-old boy, abducted from a playground, is found injured in a forest. The forgotten files resurface, and the link between the children's stories becomes apparent. As Gothenburg prepares for Christmas, Winter is in a race against time to prevent a horrific catastrophe.

Walk carefully!