Robert Preston (The Music Man), stars as Alex Dennison, a writer who is about to marry a Broadway star played by Lynn Redgrave (Georgy Girl). When she turns up dead from an apparent suicide, Dennison is convinced of foul play. He assembles the suspects in a theatre, on the pretext of a reading for his latest play. When he locks the door it turns into an intellectual game of cat and mouse that will ultimately reveal the killer. Jeff Goldblum (Jurassic Park, Independence Day) co-stars in this ingenious thriller that keeps you guessing until the end.