Set in modern northern England, this tells the story of Nora Prescott, who is beguiled by the vampiric Mormon missionary Elder Isoldi Keene. She ends an engagement and investigates Mormonism despite her father's forbidance, eventually running away with Keene. Her former fiance Jim and a private detective track the couple to London. After Nora meets Keene's first wife and rejects the horrors of Mormon polygamy, the elders determine that both women must die to atone for their sins. Nora manages to signal for help and Jim, the detective, and the police break into the Mormon headquarters, save the women, and haul the Mormons off to jail.
See Mormon Film: Key Films of the First Wave
Popular sentiment has often placed Trapped by the Mormonsat the height of the anti-Mormon film movement in the 1910s and 1920s. It was, however, one the last such films, and its dismal reception--on both a commercial and propagandistic level--helped doom the genre. It also largely ended the anti-Mormon career of its author Winifred Graham and even proved rather beneficial for missionary work in England; it was blocked, in its initial release, from playing in the United States through the efforts of Senator and apostle Reed Smoot. It was rereleased under a new title a few years later, and remade in 2005 as a completely camp spoof.