From the creator and presenter of Taskmaster comes a beautifully told story of a young boy's connection with his grandpa - and a mystery that may come between them. Trader and his grandpa have combed the beach of Bognor Regis for as long as he can remember, and every time they find a beautiful or special stone, it's added to the treasure collection. But when Trader finds a particularly special pebble, he stumbles on a secret that was supposed to be kept forever. Can Trader and his new friend Charlotte unravel the mystery of this treasure, and return it to its rightful home?