The story is set in the fictional Caribbean island and British colony of Cascara. Widely ignored by the British Government, media, and general public, local Governor Baxter Thwaites is having an easy life in his small and peaceful colony. That peace is disturbed when an abandoned oil rig starts delivering water - at the standard of the finest table water brands (and laxative companies, as it contains a substance that makes you "shit like clockwork"). Different parties, including Downing Street, the Cascara Liberation Front, the White House, French bottled water producers, and Cuban guerrillas take interest in the future of the island and threaten to destroy the cosy way of life enjoyed by the island's inhabitants.