In Brighton the crew are called out to what they think is just a routine job - towing a yacht that has lost power back to harbour - but a sudden spring squall and mountainous waves leave the crew fighting to save the yacht and themselves from being dashed on the shore. Off the east coast of Ireland, the crew of the small fishing village of Howth respond to an emergency call from a family on a local beach - a teenage girl out on a sailing dinghy has capsized and is now being swept out into the Irish Sea. While on the island of Anglesey, the crew of Moelfre are also heading out to help a family in trouble - two women have swum out to save a friend's young son being blown out to sea on an inflatable, but it quickly becomes the rescuers that need saving themselves.