Alex, a former agent retired from business, lives on a yacht anchored off Antibes in the company of his wife, the beautiful and hermetic Helen, the unfaithful wife wishing to change lives and John, her former lover who is also Alex's ex-assistant. Outside the trio, a crew of half a dozen men also lives on the boat. Alex's past is particularly busy. Ex-agent of the British secret services, the MI5, his last mission was to deliver arms to a country of the Middle East. A mission trap insofar as the weapons in question were unusable, which obviously knew MI5, but that Alex was unaware. Since then, the spy has not only been hunted down by the Arab country, but also by his former partners who want to silence an embarrassing witness. Probably sent by the English, a blonde, Galatea, like a marine nymph, begins to seduce Alex, to delay the departure of his boat by the time he gets killed. Meanwhile, Galatea and domineering Ortrud, in the pay of the Middle East to whom Alex had delivered ...