Sophie Quire and the Last Storyguard
Jonathan Auxier's second book in his Peter Nimble series was published in 2016.
It's been two years since Peter Nimble and Sir Tode rescued the kingdom of HazelPort. In that time, they have traveled far and wide in search of adventure. Now Peter and Sir Tode have been summoned by Professor Cake for a new mission: find a 12-year-old girl named Sophie Quire.
Sophie knows little beyond the four walls of her father's bookshop, where she works as a bookmender and dreams of leaving the confines of her city walls. But when a strange boy and his talking cat/horse companion show up searching for a rare and mysterious book, she finds herself pulled into an adventure beyond anything she has ever read. (From Amulet Books)