Caleb Lane and his wife Vivian Yates were in a relationship for five years before getting married. After their marriage, Caleb finds that every night when going to bed, his wife only hugs a life-sized teddy bear. She even secretly takes the teddy bear to sleep in the guest room in the middle of the night. Looking at his wife beside the pillow and the huge teddy bear lying between the two of them, Caleb always feels that besides himself and his wife, there is a third person lying on the bed.
