One Wish (The Thirteen Treasures Prequel)

Having the ability to see fairies means that Tanya Fairchild's life has never been easy. After all, real fairies are nothing like the ones in books; ones that grant wishes or leave money for teeth. Real fairies don't like to be talked about and cast spells if Tanya steps out of line, and the most she's ever received in exchange for one of her teeth is a chewed up toffee. Of course, it would help if Tanya knew someone, anyone else could see them, too ...

When Tanya meets Ratty, she finds not only can he see fairies, but even has a fairy friend, Turpin - she's rude and spiteful, but funny and loyal too. When Ratty goes missing, Tanya discovers her new friend has another extraordinary ability; an ability that has the potential to destroy them both.