The Lullaby Killer(2017)

Original title: Ach śpij kochanie

After a spate of mysterious disappearances in 1950s Kraków, young investigator Karski believes he's on the trail of a vicious serial killer. When his investigation points to wealthy and respected playboy Wladyslaw Mazurkiewicz,Karski finds himself up against his own supervisors, a mysterious woman and the hypnotic charms of Beautiful Wladek himself.