One Wish is the prequel book to the 13 Treasures trilogy.
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 they cast spells if Tanya steps out of line. 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 who could see them, too ...When Tanya meets Ratty, she finds not only that can he see fairies, but that he has a fairy friend, Turpin. Turpin is 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 ...