Dirección: Claude Whatham
Durante un viaje en tren hacia Londres, una anciana mujer llamada Lavinia Fullerton explica a un matemático norteamericano que está a punto de delatar al autor de tres crímenes acontecidos en su pequeño pueblo.
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
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
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