Mr Penumbra's 24 Hour Bookstore by Robin Sloan. This was so wonderful that I cannot keep from raving about it to everyone. Great characters and great setting. I loved everything about this book and have it on all my devices and in audio. Love it!!
The Spooks Revenge was the last book in this series by Joseph Delaney and if you want a young adult series to begin then I would say start with book one and enjoy all 13 books this series has to offer. You will not be disappointed.
I will try and put just one book for each series!