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
Prof. Luke Williams
Helen Hayes
Lavinia Fullerton
Lesley-Anne Down
Bridget Conway
Olivia de Havilland
Honoria Waynflete
Patrick Allen
Maj. Horton
Shane Briant
Dr. Thomas
Freddie Jones
Const. Reed
Leigh Lawson
Jimmy Lorrimer
