Sosuke Natsukawa is a Japanese physician and novelist. He graduated from the Shinshu University medical school and practises medicine at a hospital in the largely rural prefecture of Nagano. His multi-volume debut novel, Kamisama no Karute (God’s Medical Records), has won several prizes and has sold over three million copies in Japan. The Cat Who Saved the Library is the second book in his bestselling series featuring Tiger the talking tabby cat.