Night Shade — Dorothy Daniels

Alison, a lovely, young clinical psychologist, was called to investigate the possible suicide of a corporate giant, Clifford Dalton. She knew of the dead man's harsh reputation, his last bitter words, and his recorded threat to return and ruin all his enemies. At the request of Dalton's relatives, a medium was brought to a seance, and contact with Dalton's spirit was made. From then on, his shade haunted the household, and his maniacal laugh resounded in the halls. Suddenly, two people associated with the investigation were murdered.

As Alison zeroed in on the truth, she realized that she was marked as the next victim!