Whenever a criminal is killed in London, a black Jaguar is nearby, with a white cat always sitting in the passenger seat. Inspector Higgins and Inspector Lane find a joker card on all the victims. Their investigation leads them to a diamond smuggling ring.

Edgar Wallace: Die Katze von Kensington

Barely released from prison, gentleman robber mastermind Werner Blücher already plans another major heist and prepares a 'shopping list' for his cahoots. Taxi-driving kin Andy Walz is reluctant until he hears it may render him and wife Suzanne rich. Young Andy Walz is eager enough to impersonate a cop in his late grandpa's uniform to 'borrow' a broken-down beat-car. Target is the warehouse used by crime baron Leo Kaiser, where they find tobacco bales filled with cash earmarked for incineration. Incompetent police commissioner Schmitz-Kesselhoff tailed Blüchner but tips off Kaiser, assuming him to be in cahoots, so his political ally has the case removed from the PD by the time her abused underling Müller Zwo could catch Andy rolling in stolen cash. The stately home of bed-ridden Dr. Ballmann, suggested by Andy, who minds him regularly, as stash becomes the scene for a spectacular disappointment in the finale.