Cookie-cutter thriller capitalizes on popular "psycho-destroys-your-normal-life" theme. Average yuppie couple (Kline and Mastrantonio) are startled and then seduced by the couple moving in next door (Spacey and Miller), who conduct a considerably less-restrained lifestyle. Wife-swapping leads to murder and an innocent man is framed. Plot and characters are underdeveloped yet manage to hold interest through decent performances.