Showman Frank Hansen exhibits the “Iceman”—a Bigfoot-like creature encased in ice—at the International Livestock Exposition in Chicago. This “relic of the ice age,” he claims, was found in the waters off Siberia. The news soon reaches Ivan T. Sanderson of the Society for the Investigation of the Unexplained.

A sentient haunting involves an intelligent, conscious entity—such as a ghost, spirit, or even a living, aware house—that interacts directly with the environment and its inhabitants in real-time. Unlike residual hauntings that replay on a loop, sentient hauntings are driven by motivation, allowing the entity to communicate, react, and purposely cause disturbances like moving objects, noises, or manipulating technology.

Spirit attachments can manifest in different ways, ranging from subtle energy shifts to more obvious disturbances. While the following signs may indicate the presence of an attachment, it's important to recognize that many of these experiences can also be explained by other psychological, emotional, environmental, or physical factors. 

Known laws of physics cannot explain how a decaying human body could emit an intense burst of vacuum ultraviolet radiation or how a body could become transparent.