Deep End is a 1970 British film directed by Jerzy Skolimowski and starring Jane Asher and John Moulder-Brown. The film revolves around Mike, a 15-year-old boy who takes a job as a towel boy at a busy swimming baths in London. There he meets Susan, a beautiful young woman who works as a lifeguard at the pool. Despite the fact that Susan has a fiancé, Mike becomes infatuated with her and starts to obsess over her.
Mike's obsession with Susan leads him to stalk her and her fiancé, even going so far as to follow them home and spy on them through their windows. Meanwhile, Mike begins to grow increasingly resentful of his lowly position at the swimming pool and his lack of success with Susan.
The film is a dark and unsettling portrait of obsession and desire, and it explores themes of adolescence, sexuality, and the nature of relationships. The pool where Mike works becomes a metaphor for the turbulent and unpredictable waters of human desire, and the film's ending leaves the audience with a sense of ambiguity and unease.