Scene of the Crime S42 E31 Borowski and the Cool Dog

Two seemingly unrelated cases bring Germany and Sweden together to catch a serial killer. In Kiel, a man jumps into a bathing lake - and is impaled by bamboo sticks. For Borowski and Sarah Brandt, it is initially not clear whether it is the act of a madman who accidentally finds his victims. Or did someone want to punish the dead?