She mates and she kills.
Federal agent Alexandra Barnes believes that Catherine Petersen is a serial killer who marries rich men and then murders them for their money. But since Catherine is seemingly a master of disguise and has multiple identities, Alexandra can't prove anything with conventional detective work. With no other option, she goes undercover, pursuing the same man as Catherine, and hoping that Catherine will slip up and reveal her true identity.
Producer: Harold Schneider
Director: Bob Rafelson
Writer: Ronald Bass
Director of Photography: Conrad L. Hall
Black Widow 1987 trailer