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In July 1985, the Greenpeace flagship Rainbow Warrior, a symbol of peace, has just returned from a visit to Rongelap in the Marshall Islands, whose inhabitants are suffering the horrific effects of nuclear fallout following the 1954 testing of the American H-bomb Bravo – a weapon 1,000 times more powerful than the bomb dropped on Hiroshima.

The ship travels south to Auckland Harbour, New Zealand, where the crew are to lead a flotilla of boats protesting against French nuclear tests in French Polynesia. But their mission is stopped when two explosions sink the ship, killing a crew member. The hunt for the perpetrators begins.