On the calm waters of Antigua and Barbuda, married adventure-seekers Kathy and William Clever, skipper Ian Cridland and deckhand Thomas Williams have only begun the grip of a lifetime, sailing from the UK to the eastern Caribbean. But their vacation in paradise is cut short when all four are found murdered on board their luxury yacht, the first murders on the tiny island in over 60 years. Could this be a robbery gone wrong, or was something more malicious afoot?