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?