Shadow people

the long version

During a séance, psychic Peter Warlock is confronted by a group of evil spirits, beings who have the power to kidnap a person's soul. Peter is taken to another plane, where he confronts a serial killer about to claim his next victim. He soon realizes that the shadow people are connected to the serial killer, who is a member of a group of evil psychics who murdered his parents years ago. To save many lives, Peter may have to tap into a legacy that he has always dreaded--and a power that may consume him.--From publisher description.