AD 998. When Brother Ciarán, a resourceful Irish monk, discovers a forbidden tome and a mystery about a lost book of scripture, he finds himself plunged into a secret war as old as the origin of evil itself.

Pursued by a heretic-hunting bishop, Ciarán and his freethinking mentor flee to France in search of the scripture. The lost book of the Bible warns of the Nephilim, the descendants of fallen angels who seek to free their master, the Dragon, and bring about the events foretold in the book of Revelation. Yet the book also speaks of Enoch's device, a cryptic weapon with the power to defeat them.

Along with a beautiful noblewoman who holds a key to the mystery, Ciarán and his mentor must race across Europe to find the device, which has left clues of its passage through history: from the time of Solomon to the reign of King Arthur and the paladins of Charlemagne. But time is running out, and if they don't find the device soon, all that they love could perish with the End of Days.