
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.
Cast

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

Jonathan Pryce
Mr. Ellsworthy

Ivor Roberts
Vicar
Trevor T. Smith
Rivers

Anthony Valentine
Abbot

Timothy West
Lord Gordon Easterfield

Carol MacReady
Mrs. Pierce
Diana Goodman
Rose Humbleby
Frederick Wolfe
Avery

Patrick Wright
Attendant
Crew

Claude Whatham
Director

Carmen Culver
Teleplay

Agatha Christie
Novel
David Newhouse
Editor

Brian Tufano
Director of Photography

David L. Wolper
Executive Producer
Stan Margulies
Producer
Joan Carpenter
Hairstylist
Barry Richardson
Hairstylist
Eddie Knight
Makeup Artist
Ernest Gasser
Makeup Artist

Gerald Fried
Music
Ann Mollo
Set Decoration
Ian Whittaker
Art Direction
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