Chief Inspector Birkett (Ian Hendry) and Sergeant Saunders (Ronald Fraser) are called in to investigate the murder of a glamorous model. They discover that the murdered girl has led a chequered life and that her acquaintances include drug pushers. Jordan Barker (Jeremy Brett) and Hammond Barker (Peter Arne) are reluctant to help but when the police finally make an arrest, another murder occurs in a seedy Soho Jazz café. But are the two murders connected?