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
dennyjt
osy Christie update with Bixby as a computer expert drawn into a sequence of murders in a small village. It begins when he encounters Hayes on the train London, where she says she is going to Scotland Yard to tell them of the suspicious deaths and tell them who was responsible. However, minutes afte...