A small Mediterranean island is populated by a few dozen English families. Having grown sick of life in a mainland Britain that has become alien to them, they exist in splendid isolation, with only a handful of TVs, radios and boats to connect them to the outside world. In an attempt to recreate an idealised version of their homeland, the residents adhere to a strict charter for living, and an elected committee determines who is allowed entry onto the island.
Fear begins to spread among the inhabitants when warnings arrive of a deadly, and highly infectious airborne virus that is sweeping across mainland Europe and their neighbouring islands. Having taken a vote to close off the borders of the island, the residents slowly begin to lose control of reality, and each new threat from unwelcome guests feeds a spiral of panic, distrust, and slaughter.
What arrives on the island when it has all but destroyed itself is not what the last residents expect.