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.


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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
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