Levi (Dustin Hoffman Dustin Hoffman) lost his father not long ago, which brings him and his brother Doc (Roy Schneider Roy Scheider) closer together. One day, Levi met a beautiful girl named Elsa (Marthe Keller Marthe Keller). Immediately, Levi, who fell in love with Elsa, launched a warm offensive to Elsa. Soon, the two came together. Levi invites Doc and Elsa to lunch. The keen Doc discovers Elsa's hidden secret. Not long after, Doc is killed. Levie was shocked that Doc was an agent working for a secret government organization, and his death was not an accident, but a victim of political struggle. With the help of police officer Jenny (William Devane William Devane), Levy begins to investigate the truth of the incident, but finds that he is already at the center of the plot.