M3, T7: In hopes of contacting her beloved nephew Martin, a young scoundrel who died four years ago when a tree collided with his motorcycle, Claire Ross sponsors Dr. Douglas Holden and his psychic research. Bosley, Claire's friend and bridge partner, brings in the Angels as fake psychics to check on possible fraud. A complex TV monitoring system records the efforts of psychic Peter Wolcott and young Kathy Wade. Suddenly the voice of Martin is heard from Kathy's locked isolation chamber, and the girl is found murdered. Eerie phenomena occur; Martin's voice is heard from dark corners. Sabrina finds take recordings of "Martin," and locates killer Peter Wolcott. While videotape of Wolcott appeared on the TV monitor, he had been free to let himself into Kathy's booth. The pair had been conspiring to fleece Aunt Claire.