When an excommunicated priest dies under mysterious circumstances, his protegee Alex (Heath Ledger), is sent to Rome to investigate. He soon discovers that a "Sin Eater", a mysterious beast that literally eats sins may have had a hand in the death. The Investigation draws Alex into a dark underworld of bizarre heresy, ominous prophecies and demonic intrusions. Behind the disguise of good hides the soul of evil.
Certainly something different - a religious-based 'sci-fi' drama. Sin Eater, as it's known in UK, is a complicated story of love, fate, realisation, and a hint of gothic underworld religion thrown in. As Alex, the main character, is informed his mentor has died, he gets drawn into something which could alter his own destiny.
Without wanting to give away the entire plot Sin Eater is a movie which takes risks - it's not afraid of its take on religion and is filmed with panache, boasts good performances, and some effective cinematography.