Sam's Grandpa gives her a magic seed on his deathbed and tells her to plant it carefully and watch what happens. The mystery begins..
When Sam's beloved Grandpa dies, the one thing that helps her smile again is the gift of adventure, mystery and magic that he gives her in the form of a large seed. She plants it at the bottom of his huge garden and it grows into a magical tree with diamond leaves, but the diamonds can only be picked by people with a good heart, otherwise they turn to coal in your hand. If you touch the tree it causes a thunder storm and lightning. Sam, along with her mother and her brother Josh inherit Grandpa's cottage when he dies and so escape the poverty of their council flat in the city...until evil Aunt Sally comes along and claims the house for herself. She wants the magic seed because she knows its powers but strong-willed Sam refuses to say anything about it. They end up all living together and Aunt Sally follows Sam one day and discovers the tree hidden in a copse. She locks Sam in a shed but Josh and his dog find her with the help of some foxes they had helped previously. There are many twists and turns in this story, too many to tell...