Bruce Weyman

For the ventriloquist Gabbo his wooden dummy Otto is the only means of expression. When he starts relying more and more on Otto, he starts going mad.

The girl's father is Gunga Ras, a Hindu student of the occult. The girl's uncle is found dead and the lover blamed, but she personally investigates the crime. The father is suspected, but it develops that the death was really caused by use of liquid air in the hands of another