The New York Times
A nuanced tale that draws on elements of classic horror stories to delve into the terrifying terrain of loss. . . . Ness brilliantly captures Conor's horrifying emotional ride as his mother's inevitable death approaches. In an ideal pairing of text and illustration, the novel is liberally laced with Kay's evocatively textured pen-and-ink artwork, which surrounds the text, softly caressing it in quiet moments and in others rushing toward the viewer with a nightmarish intensity.A poignant tribute to the life and talent of Siobhan Dowd and an astonishing exploration of fear.
Kirkus Reviews (starred review)
Profoundly moving, expertly crafted tale... a singular masterpiece, exceptionally well-served by Kay's atmospheric and ominous illustrations... tackles the toughest of subjects by refusing to flinch, meeting the ugly truth about life head-on with compassion, bravery, and insight.
Publishers Weekly (starred review)
A brilliantly executed, powerful tale.
School Library Journal (starred review)
Ness twists out a resolution that is revelatory in its obviousness, beautiful in its execution, and fearless in its honesty. Kays artwork keeps the pace, gnawing at the edges of the pages with thundercloud shadows and keeping the monster just barely, terribly seeable.
Booklist (starred review)
A masterpiece about life and loss that will stay with the reader long after the final page is turned.
Library Media Connection (starred review)"