Clay Jannon shuffles into Mr. Penumbra’s 24-Hour Bookstore in search of a job and discovers another world. Clay mans the bookstore during the long hours of the night shift and is surprised to learn that there are very few real customers. Instead, the same people return regularly and, rather than buying books, check them out. A mysterious bookstore. A mysterious society. Seeking a mysterious secret hidden through the ages in books. Mysterious.Clay is intrigued and draws on the knowledge of new and old friends to solve the mysteries. I was delighted with this little story. Fun. Mysterious, of course. And ultimately satisfying.