Two inventive tales of espionage in one, from the internationally bestselling author of Japanese fiction sensation Bullet Train In Japan's recent past, Miyako suspects her mother-in-law is a murderer. She uses her secret skills as an ex-spy to investigate her, while trying to maintain a peaceful home life. And in Japan's not-too-distant future, a courier named Mito finds himself embroiled in the death of the developer of a sinister AI surveillance system. Seesaw Monster contains two sharp, thrilling novellas from the bestselling and multi-award-winning writer Kotaro Isaka.