Carole and Sydney meet a singer who's in town to perform. She reveals that some fan is following her wherever she goes. Her manager says he'll handle it. Carole and Sydney help her meet her former partner, who was shot by the fan, or someone wearing the suit the man always wears.
Carole Stanwyck and Sydney Kovack were both married to the same man, a private detective. When he is killed, they both attend his memorial. When they learn how he was killed, they can't help but investigate his murder themselves. They are aided by a couple of guys who works for him, and his mother, a police lieutenant who likes Sydney.
Carole and Sydney go to an auction and Carole has her eye on a broach. But a guy named Hermanski is also interested in it and tries to get her not to bid on it. But a surprise bidder gets the broach. He asks the girls to find him. But the man is killed. And someone else is after the broach.
Vronsky is framed. Carole and Sydney offer to help. They operate under the assumption that someone either was out for revenge or was trying to stop one of his investigations. They learn it might be the latter.