A mysterious American gets mixed up with gunrunners in Syria.

Businessman Logan Stuart is torn between his love of two very different women in 1850s Oregon and his loyalty to a compulsive gambler friend who goes over the line.

A scientist working on cures for rare afflictions, such as a bone softening agent made from molds to allow him to correct the spinal deformity of his nurse, finds the physical causes of lycanthropy in wolf-man Larry Talbot and of vampirism in Count Dracula, but himself becomes afflicted with homicidal madness while exchanging blood with Dracula.