Young Edyth Vail, believes her fiancé Allen Morris may have committed a murder, asking Ashton Kirk to investigate the crime. The fiancé admits he went to the David Hume's home to retrieve plans for a submarine, invented by his scientist father and stolen by the murdered man, but Allen claims he left the home before retrieving the plans. Kirk uses a train conductor's punch ticket to discover the identity of the murderers, one of whom is mute, and sets a trap to apprehend the suspects.
Arnold Daly
as Ashton-Kirk
Sheldon Lewis
as David Hume
Louise Rutter
as Edyth Vail
William Hartigan
as Allen Morris
Charles Laite
as Pendleton
Martin Sabine
as
George D. Melville
as
