Devil's Lair follows a quartet through Hell to find and retrieve the Holy Grail to bring the world back from the brink of destruction.  They are an unlikely group.  Marco da Roma, the last of the Knights Templar, but has no recollection of who he is.  William of Ockham, an English friar who has been defrocked.  Giovanni Boccaccio, a poet and an expert on Dante.  And finally Nadja, an epileptic with the gift of prophesy.  It is her dreams that have led this group on their quest to find the Grail and save mankind.  Each of them will need to face and conquer their own demons to push back the coming Apocalypse.