Naturalist Stewart McPherson's exploration of the UK Overseas Territories begins in Bermuda, in the north Atlantic, where he finds ancient castles and a bird that had been thought extinct for more than 300 years. Stewart then travels to the British Indian Ocean Territory, which lies halfway between Tanzania and Indonesia, where he comes across the world's biggest land invertebrate. He eventually reaches Pitcairn Island, in the southern Pacific, where he meets the descendants of the mutineers of the Bounty.