Detective Murdoch investigates the murder of Dr. Francis Grout who was killed by a hooded and robed figure using a crossbow. The doctor worked at the Greyson Institute for the Mind that specializes in researching brain functions and those who have special skills not found among the general population. As the murders continue, the police must find the common link among them. Murdoch is shaken when medium Sarah Pensell tells him she has seen these murders in a vision. While she can't identify the robed figure, she is able to identify the killer's last victim - Murdoch.