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?