It's July 1939 and even though Poland is trapped between Adolph Hitler and Uncle Joe Stalin, everyone hopes war can be avoided. On the island of Jersey, eighteen-year-old Jack Renouf is forbidden from associating with his own Uncle Fred because of his dangerous Communist views and salacious liaison with his Spanish mistress. Caught in his own velvet trap between outrageous Caroline and secretive Rachel, Jack doesn't pay too much attention to international affairs especially during this glorious summer when, despite the darkening horizon, everyone is in holiday mood. In his final days at school, Jack is focussed on breaking the one-minute barrier for the 100 yards freestyle so that he can get into the British swimming team for the 1940 Helsinki Olympics. Desperate for those last few seconds, he listens to Miko, an enigmatic Jewish refugee who works as a waiter in a local hotel but claims to have trained the Romanian water polo team for the Berlin Olympics. He persuades Jack to try some new techniques, which he promises will bring him success. But everyone else at the swimming club is suspicious of Miko who always wears the same white tee shirt and never seems to swim. An arrogant Dutchman on holiday in the island bullies Jack during a water polo match and his carefully constructed sang froid boils away as he retaliates viciously and has to suffer the disciplinary consequences. Suddenly, Jack is in conflict with everyone and his well ordered life spins away as he is sucked into a conspiracy involving the island's government, smuggled industrial diamonds, and two ruthless mercenaries seeking to retrieve them at any cost.