Carnival of Terror - Carnival of Terror Series, #1

The circus is coming to town. And terror follows in its wake.When a man is killed under mysterious circumstances, retired marine and the world's greatest ghost hunter, Shane Ryan, finds himself tangled up in the case. The trail of clues leads him to a sinister traveling carnival. And a string of new murders.Backtracking along the carnival's route, Shane discovers a ghost town filled with bloodthirsty wraiths.
Battling these undead killers, Shane is barely able to escape with his life. But he manages to unearth a link between the murder victims and a hideous crime from the town's sordid past. Years ago, a grave injustice led to bloodshed. Now, a dark, terrifying force has been unleashed: a relentless spirit, on a brutal quest for revenge. And unless Shane and his allies can stop it, more blood will be spilled.
Shane Ryan hasn't lost a battle with the supernatural yet. But this time, he may have met his match.