Mary Rose MacKinnon is a successful author of YA fiction doing a tour of duty as stay-at-home mom while her partner, Hilary, takes a turn focusing on her career. She tries valiantly to balance the (mostly) solo parenting of two young children with the relentless needs of her aging parents. But amid the hilarities of full-on domesticity arises a sense of dread. Do other people notice the dents in the expensive refrigerator? How long will it take Mary Rose to realize that the car alarm that has been going off all morning is hers, and how on earth did the sharpest pair of scissors in the house wind up in her toddler's hands? As frustrations mount, she experiences a flare-up of forgotten symptoms of a childhood illness that compel her to rethink her own upbringing, her own family history. Over the course of one outwardly ordinary week, Mary Rose's world threatens to unravel, and the specter of violence raises its head with dangerous implications for her and her children. Adult Onset explores the pleasures and pressures of family bonds, powerful and yet so easily twisted and broken. Ann-Marie MacDonald has crafted a searing, terrifying, yet ultimately uplifting story.