Secret Histories series by Simon R. Green (books 1-3)

The Man With the Golden Torc (Secret Histories #1):

From the New York Times bestselling author of the Deathstalker and Nightside series comes a new kind of hero in an old kind of war.
All those things you hear about as a kid? The boogeyman under the bed? The creature in the closet? They're for real, people.
Eddie Drood knows they're for real. His family has kept humanity safe from the things that go bump in the night. For ages, they've held back the nightmares, locked the doors, barred the gates, and put righteous boot to monster arse on a nightly basis.
But now Eddie's in trouble. One of his own has convinced the rest of the family that Eddie's become a menace, and that humanity needs to be protected from him. So he's on the run, using every trick in the book, magical and otherwise, hoping he lives long enough to prove his innocence. And he knows how dangerous the Droods can be-because he's one of them.



Daemons Are Forever (Secret Histories #2):

Second in the trilogy from the New York Times bestselling author of The Man with the Golden Torc.
Eddie Drood's clan has been watching mankind's back for ages. And now he's in charge of the whole kit and caboodle. But it's not going to be an easy gig…
During World War II, the Droods made a pact with some nasty buggers from another dimension known as the Loathly Ones, which they needed to fight the Nazis. But once the war was over, the Loathly Ones decided that they liked this world too much to leave. Now it's up to Eddie to make things very uncomfortable for them or watch everything humanity holds dear go up in smoke.



The Spy Who Haunted Me (Secret Histories #3):

Eddie Drood's evil-stomping skills have come to the attention of the legendary Alexander King, Independent Agent extraordinaire. The best of the best, King spent a lifetime working for anyone and everyone, doing anything and everything, for the right price. Now, he's on his deathbed and looking to bestow all of his priceless secrets to a successor, provided he or she wins a contest to solve the world's greatest mysteries. Eddie has to win, because King holds the most important secret of all to the Droods - the identity of the traitor in their midst.