Investigating the disappearance of children in a remote Polish town, prosecutor Leopold Bilski must unravel a sinister local legend before it’s too late.

In 1987 Poland, a police officer investigating mysterious disappearances infiltrates a remote monastery and discovers a dark truth about its clergy.

In a monastery cut off from the world, the monks run a clinic for the possessed. One day, a young policeman Marek comes to the convent. Posing as a clergyman,…