Nanami sees nothing wrong with a library and cat combination. But a talking cat is a whole other story.

Thirteen-year-old Nanami Kosaki loves reading. The local library is a home from home and books have become her best friends.

When Nanami notices books disappearing from the library shelves, she's particularly curious about a suspicious man in a grey suit whose furtive behaviour doesn't feel right. Should she follow him to see what he's up to?

When a talking tabby cat called Tiger appears to warn her about how dangerous that would be, together they're brave enough to follow the frightening trail to find out where all the books have gone. Will Nanami and Tiger overcome the challenges of the adventure ahead?