The fish sold at market in Peterhead comes from fishing boats all over Scotland, even as far as northern harbour Scrabster, where fishing boat Reliance is preparing to set sail. On this trip, owner of Reliance, John Clark, is stepping aside as skipper to let his 22-year-old son David take the helm for the very first time. John is on board working as first mate and keeping a close eye on David, making sure he is doing everything by the book, but will David have what it takes to prove to John he can skipper Reliance alone?