The Library of the Unwritten - A. J. Hackwith

Join the library and raise hell in the first book of a stunning new fantasy series, where books unfinished by their authors reside within the Unwritten Wing of the devil's own library, and restless characters will emerge from out of their pages... When a Hero escapes from his book and goes in search of his author, Claire must track and capture him with the help of former muse and current assistant Brevity and nervous demon courier Leto. But what should have been a simple retrieval goes horrifyingly wrong, in a chase that threatens to reshape the boundaries between Heaven, Hell... and Earth.