Demons and druids - James Patterson

The Alien Hunter is playing with fire ... but who will get burned?

Daniel X's hunt to eliminate each and every intergalactic criminal on Earth is always relentless, but this time it's getting personal. Number Three on the List of Alien Outlaws takes the form of raging, soul-possessing fire. And fire transports Daniel back to the most traumatic event of his life - the horrifying murder of his parents.

In the face of his 'kryptonite', Daniel struggles with his extraordinary powers like never before, and more than ever is at stake: his best friends are in grave peril. The only way to save them is to travel back - through a hole in time ?- to the demon's arrival during the Dark Ages. There Daniel embarks on an ancient Arthurian crusade that takes him one terrifying step closer to the 'Holy Grail' of aliens: Number One on the List, his parents' killer.