A riveting technological thriller following a woman whose life is upended when her husband and son disappear in a mysterious plane crash and she is left alone with an unnerving home robot, only to get caught up in an AI-related conspiracy.

In near-future Japan, Susie Sakamoto is mourning the loss of her husband and son to a plane crash. Alone in her big modern house, which feels like more of a prison, Susie spends her days drinking heavily and taking her anger out at the only "sentient" thing left in her life: Sunny, the annoying home robot her husband designed. Susie despises Sunny, and sometimes even gets a sinking feeling that Sunny is out to hurt her.

To escape her paranoia and depression, Susie frequents the seedy, drug-fueled bars of the city, where she hears rumors of The Dark Manual, a set of guidelines that allow you to reprogram your robot for nefarious purposes. In the hopes of finding a way to turn off Sunny for good, Susie begins to search for the manual, only to learn it's too late: the machines are becoming more sentient and dangerous. Thrust into the center of a dark, corporate war, Susie realizes there's someone behind the code, pulling the strings. And they want her dead.

With a darkly humorous yet propulsive and lyrical voice, O'Sullivan presents us with an unsettling look at a future that feels all too real. Gripping and thought-provoking, Sunny is a haunting character study of an anxious woman teetering in an anxious time.