Twins Georgia and Adam can’t wait to go on their holiday to Cornwall – especially as it’s the first time they’re taking their new puppy Lucky with them. Lucky loves the seaside – chasing the waves digging in the sand and the long cliff-top walks. One day the children go out by themselves but they get into difficulty and the puppy ends up falling partway down a cliff. Unable to reach him themselves the twins are distraught to see Lucky’s paw is hurt too. Will they find a way to rescue poor Lucky?