This is a story about a ghost boy who finds himself in a new, unknown place for the first time in his life - a library full of people. It is very strange to see so many people in the room, and even more strange when one girl definitely sees you and really wants to make friends. And despite their differences, they are united by the desire to reveal secrets. The first "criminal case" did not take long: Grandma Claire tells that a ghost has been living in the library for a long time. Will the friends be able to neutralize the unfriendly ghost?