Phantom Prey (Prey, Bk. 18)

After one troubled college student disappears and two are found slashed to death, Lucas Davenport finds himself hunting what appears to be a modern-day Jack the Ripper. Unfortunately, the clues aren't adding up - and then there's the young Goth girl who keeps appearing and disappearing. Where does she come from? Where does she go every night? And why does Lucas keep getting the sneaking suspicion that there is something else going on here? Something very bad, very dark, and as elusive as a phantom . . .