This is the mystery novel "Lemon and the Murderer" (Takarajimasha Bunko) by Kuwagaki Ayu. It won the 21st "This Mystery That's Amazing!" Award, Bunko Grand Prix, and has sold over 300,000 copies. Synopsis: The Kobayashi sisters have a harsh past, with their father murdered by a random attacker 10 years ago and their mother disappearing. However, the story begins to move when the younger sister, Hina, is found dead. While the victim, Hina, is suspected of "insurance murder," the older sister, Mio, begins searching for the real culprit to prove her sister's innocence. Features: This is a psychological suspense novel characterized by a torrent of twists and turns and plot resolutions that judges and readers have described as "twisting and turning two, three, four, and even five times." Recommendation: On the obi, actress and voice actress Nagisa Saito has given a recommendation, saying, "For me, who loves plot twists, this was the best work!"