Iris Fallowfield lives with her mother in a sad little cottage. Iris is so good at following the rules that when teachers need help remembering the school rules, they come to her. But when Iris discovers a strange packet of seeds under a tree in her backyard, that all changes. She's hearing voices, seeing things, and then flowers begin to grow out of her head. As plants begin to sprout from the heads of other people in town, Iris discovers the truth about her town and tries to change things for the better.