A somewhat daffy book editor on a rail trip from Los Angeles to Chicago thinks that he sees a murdered man thrown from the train. When he can find no one who will believe him, he starts doing some investigating of his own. But all that accomplishes is to get the killer after him.

Gene Wilderas George Caldwell
Jill Clayburghas Hildegard 'Hilly' Burns
Richard Pryoras Grover Muldoon
Patrick McGoohanas Roger Devereau
Ned Beattyas Bob Sweet
Clifton Jamesas Sheriff Chauncey
Ray Walstonas Mr. Edgar Whiney
Stefan Gieraschas Professor Schreiner & Johnson
Len Birmanas Chief
Valerie Curtinas Plain Jane