Sara MacGilvey has encountered duplicates before, but this time she's the one who's been duplicated. Ordinarily, such an attack would take several days to kill its victim, but for some reason Sara's life is ebbing away at an unexpected and alarming rate; only hours after being sampled, Sara finds herself on the brink of death.Her friend Stephanie, plagued by psychic dreams of fruitless searching and of a child in pain, tries to understand her visions before Sara is lost forever. But when she realizes what's being asked of her, Stephanie questions her ability to save her friend, the child who haunts her dreams, or even herself.Hoping to corner the duplicate in a remote clearing in the woods, Sara, Stephanie and their other friends gather in a protective circle. Their efforts may be in vain, however, since their ruthless opponent is highly motivated to keep her prize ... and her strength is building by the minute.