One of the hundred books a year I read:

Jamie Conklin wants only to be a normal kid. The ups and downs of his family life are strain enough, but normal kids can’t see and talk to dead people. They certainly can’t make dead people tell the truth like he can.

That skill, however, is quite valuable to an NYPD detective fighting to keep her job, so she involves Jamie with a serial killer. That murderer, though, has promised to continue his reign of terror from the grave, and includes Jamie as a target for revenge.