The Forbidden Library, by Django Wexler, is the first book in The Forbidden Library series. It’s an excellent book and I enjoyed it immensely. The main character is Alice who finds out she is a type of person called a Reader, with a capital “r.” Readers like Alice can send themselves into books and capture the creatures inside of them. In order to capture the creatures, they have to defeat them first, then find a special mental thread they tug with their mind which makes the creatures just suddenly pop into existence. Some of the creatures she captures are Swarmers. They are little black fuzzball things that look cute, but have a penchant for blood. Kind of nasty unless you’ve tamed them.