Arne Dahl - A Midsummer Night's Dream(2015)

Overview:

A series of brutal murders of Polish women who secretly hiding in Sweden becomes the new A - team first case. The victims prove to be key witnesses in a major lawsuit against the Polish mafia . Three of them have been found murdered in the space of a few days , two missing and the hope is that they are still alive. Detective Kerstin Holm get command when the hunt for a ruthless killer and his shady victim begins.