Police Lieutenant conducting a personal crusade against gangster Mr. Brown. He investigates Brown's criminal network, becomes dangerously obsessed with Brown's girlfriend Susan Lowell, and tracks down Brown's hidden wife, Alicia. After surviving a kidnapping and torture, he coordinates with Alicia and Susan to dismantle Brown's operations, culminating in an airport shootout where he arrests Brown.
Their opposing campaigns drive the central criminal and investigative conflict.
Diamond conducts a personal crusade to bring down Mr. Brown, while Brown repeatedly attempts to silence and kill him.
Rita is Diamond's personal partner whose death intensifies his pursuit of Brown.
The plot identifies Rita as Diamond's burlesque dancer girlfriend, and she is killed when Brown's men mistakenly target Diamond's apartment.
Diamond's attraction complicates his investigation and motivates his attempts to free Susan.
Diamond is dangerously obsessed with Susan and admits that he may be in love with her.
Fante is a direct physical threat to Diamond and those close to him.
Fante participates in Diamond's kidnapping and torture and later helps attack Diamond's apartment, where Rita is mistakenly killed.
Mingo changes from violent opponent to crucial witness against Brown.
After surviving Brown's assassination attempt, Mingo confesses to Diamond that Brown was behind the murders.
Explore the full interactive character relationship map of The Big Combo