In the center of the story is a man named David Kim. After the death of his beloved wife, he alone brings up Margot's daughter with whom they are best friends. The girl is already quite grown up, finishes school and takes the entrance exams to college and seems to be a happy and sociable child. One day, Margot begs his father for additional classes late, but does not return. The father is concerned and tries in every possible way to communicate with the daughter, but without success, neither on SMS nor on calls Марго does not respond. Asking the children with whom she was engaged, David finds out that Margot left before she spoke to him. He suspected something was amiss and decided to dig in her computer. After viewing all of her social networks and communicating with her supposed friends, David understands how badly he knew his own daughter.