Twins Jacki (Judy Geeson) and Julian (Martin Potter) arrive in swinging London and quickly fall in with the wrong crowd. Well, smarmy Clive (Alexis Kanner) to be more specific. Clive worms his way between the tight bond the twins have and, after he threatens to blackmail Julian, some killing goes down. This is a pretty minor horror-thriller as nothing really happens for the first 50 minutes. After that, it is a half hour of overwrought drama as Jacki runs from the law and gets help from an old guy. The film's biggest merit is probably the capturing the bars, folks and style of late 60s swinging London. Oh, and the hippest debt collector you will ever see. There is also some pretty snappy dialog and Kanner is really good as the would-be blackmailer.