Blood Drinker - Grave Investigations, #1

When a vampiric serial killer turns the world of law enforcement upside down with a series of brutal murders, the FBI is forced to rely on the legendary unorthodox detective Arthur Graves. Although his methodology is questionable, his ability to get results is undeniable. Meanwhile, unknown and struggling college student Henrik Meyer is prepared to take on his idol. Determined to fulfill his lifelong goal with little more to his name than his nearly empty bank account and his haughty vampire companion, he prepares to confront the legendary detective in a tactical battle of wits to secure the key to the vampire's immortality: her phylactery.
But as the forces of justice draw ever closer, the young student will have to choose between his humanity and his ambitions.