In 1943, the US Navy conducts experiments to make our ships appear invisible to the enemy. The test ship, the USS Eldridge, disappears from the Philadelphia Shipyard and when it finally returns, sailors are embedded in the hull of the ship, some get sick, others go insane, and others become invisible. The government-sponsored project succeeds in creating invisible men; shadow men. Encouraged by their success, they commission an agency, the National Science Research Agency (NSRA) to oversee an attempt to create an invisible army.Adam Grimes, the director of the project, an intelligent physicist, creates several shadow people and wolves that are large, aggressive killers. The shadow people turn against him and escape taking the wolves with them.Eager to get rich beyond his wildest dreams, Grimes leaves the project taking the documentation and some of the wolves with him. Using Cold Ridge, Kentucky as a test site, he infects the town with parasites that enter the human body and then are born as wolves. The military, under the direction of NSRA moves in and puts the town under quarantine.In the seventies, several teens, Brad Randall, Patricia Morgan, Larry Carter, Emily Barber, Carrie Nelson and Jason Kidd encounter the shadow men while on a winter camping trip. The memories haunt them for many years.Brad Randall returns to Cold Ridge to find out what really happened on that day and runs into a nightmare worse than any of his dreams.