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
as Prof. Luke Williams
Helen Hayes
as Lavinia Fullerton
Lesley-Anne Down
as Bridget Conway
Olivia de Havilland
as Honoria Waynflete
Patrick Allen
as Maj. Horton
Shane Briant
as Dr. Thomas
Freddie Jones
as Const. Reed
Leigh Lawson
as Jimmy Lorrimer
Jonathan Pryce
as Mr. Ellsworthy
Ivor Roberts
as Vicar
Trevor T. Smith
as Rivers
Anthony Valentine
as Abbot
