Basil and Dawson are on their way to visit Oxford and see their old college friends. But when they arrive, their friends tell them that the college library is being haunted and strange things have been happening. Basil thinks someone is impersonating a ghost for their own nefarious ends, but Dawson wonders if something else might be going on. Meanwhile, Ratigan has escaped prison and Basil is on high alert, searching for any clue to his whereabouts.

I love this story so much! I have always been a fan of the Great Mouse Detective cartoon, so I was delighted to discover that the movie was based on a book series. The writing is charming, the story is exciting, and the mystery is full of wild clues that only Basil can figure out. I also loved the adorable illustrations that bring the characters to life.

This chapter book would be perfect for young readers ages 6-10 who are starting to read on their own, but it is also enjoyable for older children to read. I loved reading it even as an adult!