Phil discovers a strange girl, Tracy, claiming to be his daughter. Shocked, he realizes his wife, Nancy, orchestrated a swap to fulfill his taboo fantasies. Repulsed, Phil distances himself, but Nancy reassures Tracy that he'll come around. Despite Phil's discomfort, he's repeatedly drawn into family moments with Tracy, who hints at seduction, aligning with his secret desires. Phil struggles to resist his twisted urges, denying the fantasy in his head. One night, Tracy, feigning a ...