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.
| Directing | Peter Keglevic | Director |
| Writing | Simon Borowiak | Screenplay |
| Writing | Edgar Wallace | Novel |
| Writing | Hans Kantereit | Screenplay |
| Sound | Jürgen Ecke | Music |
| Camera | David Slama | Director of Photography |
| Editing | Moune Barius | Editor |
| Costume & Make-Up | Ulrike Schütte | Costume Design |
| Sound | Andreas Kaufmann | Sound |
| Production | Kerstin Dyroff | Production Secretary |
