Hard Day's Knight

In the first volume of The Black Knight Chronicles, detectives Jimmy Black and Greg Knightwood investigate a series of mysterious disappearances with the help of the friend, Father Mike. The investigation is hampered by interference from the police, a dozen marauding zombies, a middle-aged necromancer, and the fact that our heroes can only look for clues by night. Because they're vampires. Vampire detectives kicking zombie butt all over town, what could be better?