All the proceeds are going to Children in Need!
The guys from One Direction have written a story for The Curious Tale of Fi-Rex!
It tells the story of a half-girl half-dinosaur called Fi-Rex who meets all kinds of weird and wonderful characters on her quest home!
You can pre-order the book here and it’s available from September 16th!
All of the money raised from the book will go to Children In Need!
Watch some classic 1D below!