Nuwan works at the library, delivering books. One day, he accidentally takes away a very valuable key that's been hidden inside one of the books, and in the process thwarts the plans of some very dangerous thieves. On the run, he hides in a cave, only to discover in the middle of the night that he is sharing it with a big, hairy, terrifying bear! After some hair-raising moments, he and the bear reach an understanding and they travel on together, evading the bad guys and hoping the key will unlock the answers to the mystery so that they can stop running and return home...