Sea-loving groom Dave wants to whisk his waterphobic bride-to-be Rosie off to a remote island wedding. But it's not just any island, it's windswept Lundy Island off the coast of Devon, where Rosie once nearly drowned and had to be rescued. After three weeks battling the elements, in a last-ditch attempt to win over his bride's close-knit family, will Dave's risky wedding plan be plain sailing or run aground?