'It concerns the adventures of Bruce Sommervllle, and how he helps to checkmate the machinations of Slim Jim and his gang of cattle-duffers, who are known and dreaded over a wide area as "The Vanishing Horsemen.".
Source:
'"The Vanishing Horsemen" (A.E. Yarra)', World's News, 6 August 1930, p.34.
London : Selwyn and Blount , 1930