The Greyling's Treasure has been lost for many, many years. But Jeffrey, Susan and John Greyling find an old map of where the treasure is hidden, when they are staying with their grandparents. So they decide they must find the hidden treasure and keep it in the family, before their grandparents sell the family home to Mr Potts, whom the children nickname - Mr Pots of Money! But Mr Potts is also interested in finding the Greyling's Treasure, and so it is a race against time of who will find the treasure first. Mr Pots of Money or the children, who want to save their family home.