Tammy goes unconscious when she falls asleep. She wakes to find blood all over her body, but no wounds, and finds she's lost all memory of what happened. She seeks help from Sam's Detective Bureau. At the same time a mysterious man asks Sam to investigate some recent murders, seemingly caused by some sort of vicious animal. During his investigation Sam finds that the animal's DNA seems to indicate that it is a cheetah, and that Tammy's DNA is the same. When Sam rushes over to Tammy's house, he finds something that must be seen to be believed.