American computer whiz Luke Williams meets elderly Lavinia Fullerton on a London-bound train. She reveals she's discovered the identity of a serial killer in her village and is going to report it to Scotland Yard. When she is murdered after disembarking the train, Williams vows to pursue the case himself.
Bill Bixby
Helen Hayes
Lesley-Anne Down
Olivia de Havilland
Patrick Allen
Shane Briant