The Third Key (1983) is a Mystery, Thriller, Crime film that follows a young couple have settled in a new flat. Soon somebody begins watching them and they receive great amounts of money from an unknown sender. The Third Key is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 6.2 out of 10 from 5 votes. Fans of mystery movies may also want to explore similar titles below.