Finders Keepers. Marilyn Kaye

Dead people don't make great companions, something cute, athletic Ken finds out the hard way when, following an accident on the football field, he starts hearing ghostly voices. It's not the kind of gift he would have asked for - especially when it gets him involved in a love triangle with his dead best friend's girlfriend - but there's nothing he can do about it, until an anonymous note invites him to a seance. Completely convinced by the medium he meets, Ken tries to tell her about his secret. Only his gifted classmates can save him from revealing the truth - and finding himself in terrible danger...