"The Midsummer Equation" by Keigo Higashino Kyohei, a young boy, spends his summer vacation at an inn run by his aunt's family in Harigahama. Meanwhile, Yukawa, visiting for work, also stays at the inn. The next morning, another guest is found dead. That guest was a former detective who had once arrested a man connected to Harigahama. Is this an accident or a murder? What is the truth that Yukawa has discovered? The book is generally in good condition. Please check the images for details. [Shipping Method] We plan to ship via Yu-Mail. It should arrive in about 2-7 days from the date of shipment, depending on the destination area.