Sergeant Scobie Malone of the New South Wales Police (NSW Police) is summoned to Sydney by the gruff Premier of New South Wales, Mr Flannery, who asks Malone to travel to London and arrest the senior Australian diplomat in Britain, Sir James Quentin, High Commissioner to the UK.

As Malone waits as a guest of the High Commission, he uncovers a plot to assassinate Sir James, masterminded by the head of a dangerous spy ring, Maria Cholon.

[6] The Monthly Film Bulletin wrote: "Despite a basically promising situation, a distinguished cast and plenty of gloss, this thriller is a catastrophic failure on any level.

The actors are scarcely able to conceal their embarrassment with the impossible dialogue they are given, Daliah Lavi and Camilla Sparv are wasted, and even Clive Revill is hard put to raise a couple of laughs from his snobbish reactions to an Australian from the outback.

The script rambles along without rhyme or reason, and the most obvious opportunities for suspense (like the attempted assassination on the Centre Court at Wimbledon) are badly mishandled.