Based on the comic book "Hellblazer", Constantine tells the story of irreverent supernatural detective John Constantine (Reeves), a man who has literally been to Hell and back. Since he was a child, Constantine has possessed a rare gift: the ability to see beyond the normal world and identify the half-breed angels and demons who live among us. However, he regards his psychic ability as a curse and faces apparently certain damnation after committing suicide, a mortal sin, and returning from Hell. In an attempt to redeem himself and win a place in Heaven he sends these demons back to Hell, one by one. Constantine's path soon crosses with a sceptical detective named Angela Dodson (Weisz) who is investigating the suicide of her twin sister. She needs his help to solve the mystery surrounding her sister's apparent suicide, and hopefully save her from an eternity in Hell.
From the perspective of someone who hasn't read the comics I really enjoyed this film and obviously wasn't influenced by any differences it may have to the comic. From the perspective of a lapsed Catholic I love a film about angels and demons and everything in between, and learnt a few things that Catholics apparently already know (at least according to the filmmakers) along the way.