Dragon's greenScarlett Thomas2017

Effie Truelove believes in magic, as does her grandfather Griffin (although he refuses to do any magic, let alone teach Effie how to use it). After a mysterious incident leaves Griffin close to death, Effie is given an unusual silver ring and told she must look after her grandfather’s library of rare and powerful books. But then the books fall into the hands of shady scholar Leonard Levar, and Effie is propelled into the most dangerous adventure of her life.

Now, Effie and her friends—nerdy Maximilian, rugby-mad Wolf, helpful Lexy, and eccentric Raven—must discover their true powers if they are to get the books back. And Effie alone will have to travel to the Otherworld, where she will uncover the true meaning of the strange old book called Dragon’s Green…