Oxford Reading Tree Stage 7 Fireflies Takehome Cards Author:Sue Calcutt Oxford Reading Tree Fireflies is a series of intriguing non-fiction books, from the freaky to the glorious, for children aged 3-9. They are available in mixed packs of six books or class packs of 36 books. These Take-Home Cards offer high-quality help in making the most of time spent reading at home with parents and carers.