Plot: A criminal referred to by the press as “The Wrecker” is orchestrating accidents on Britain’s railways. One such accident occurs on the (fictional) United Coast Lines Railway, whose train is carrying Roger Doyle (Joseph Striker), who has retired from Cricket to work on the railway. Roger survives, and reports the accident to his uncle, Sir Gerald Bartlett (Winter Hall), the managing director of the railway, and his assistant, the sly Ambrose Barney (Carlyle Blackwell). Unbeknownst to them, Ambrose is The Wrecker, and is also the head of the Kyle Motor-Coach Company, whose buses are introduced on services where The Wrecker has struck, hoping to frighten passengers off of the trains and onto buses. When Sir Gerald becomes suspicious of Ambrose following yet another accident, he is shot dead.
After receiving a tip-off from one of Ambrose’s employees, Roger and bumbling detective Ramesses Ratchett (Leonard Thompson) foil another planned accident, much to the delight of the press. Ambrose, enraged at being foiled, plans another accident, but his conversation is recorded onto a wax cylinder by Roger and his girlfriend, Mary Shelton (Benita Hume), Sir Gerald’s secretary who had been on the train that Roger had saved from disaster. On hearing the wax cylinder that exposes his crimes, Ambrose shoots the phonograph, destroying the cylinder, and flees from Roger and Mary, only to find himself on the very train that is to be wrecked. Ambrose holds Roger at gunpoint, but is attacked from behind by Mary and subdued, and the train is brought to a safe halt. With Ambrose defeated, Roger and Mary profess their love for each other, disappearing in a cloud of steam as the train reverses away.