John Constantine has been to hell and back.

Born with a gift he didn't want - the ability to recognise the half-breed angels and demons that walk the earth in human camouflage - Constantine (Keanu Reeves) was driven to take his own life to escape the torment of his vision.

But he failed. Resuscitated against his will, he found himself cast back into the land of the living. Now, marked as an attempted suicide with a temporary lease on life, he patrols the earthly border between heaven and hell, hoping in vain to earn his way to salvation by waging war on the earthbound minions of evil.

But Constantine is no saint. Increasingly disillusioned by the world around him and at odds with the one beyond, he's a hard-drinking, hard-living hero who scorns the very idea of heroism. Constantine will fight to save your soul but he doesn't want your admiration or your thanks - and certainly not your sympathy. All he wants is a way out.

When Angela Dodson (Rachel Weisz) - a desperate but skeptical police detective - enlists his help in solving the mysterious death of her twin sister, their investigation takes them through the world of demons and angels that exists just beneath the landscape of contemporary Los Angeles. Caught in a catastrophic series of otherworldy events, the two become inextricably involved - and seek to find their own peace at whatever cost.

Synopsis

John Constantine (Reeves) is a world-travelling, mage-like misfit who investigates supernatural mysteries and the like, walking a thin line between evil and good. Constantine teams up with a female police detective, Angela (Weisz), who seeks Constantine's help while investigating the suicide-like death of her twin sister. Does it have something to do with a mysterious group called "The First of the Fallen"? And what is it about Constantine that puts him in a position where he is making deals with representatives from both Heaven and Hell?