is a Japanese light novel series by Kazuki Sakuraba, with illustrations by Hinata Takeda. The series includes 13 novels published by Fujimi Shobo between December 2003 and July 2011. Set in a fictional European country in 1924, a Japanese exchange student meets a mysterious, brilliant girl who only leaves the library to sleep. Her brother, a detective, relies on her exceptional mind to solve difficult mysteries. Tokyopop released the first two novels in English in North America. A manga adaptation drawn by Sakuya Amano was serialized in Fujimi Shobo's Monthly Dragon Age magazine. A 24-episode anime adaptation by Bones aired between January and July 2011. A sequel novel titled Gosick Red was released in December 2013.