Costa Book of the Year: This novel of science, magic, murder, and a determined Victorian-era teenager is a “heady concoction . . . absolutely unforgettable”

An amnesiac girl explores an enchanting underground world filled with sinister secrets in this YA fantasy from the award-winning author of The Lie Tree. In the

“Equal parts dazzling fantasy, swashbuckling adventure, and tender coming-of-age tale” from the author of the Costa Book of the Year, The Lie Tree (Publishe

“Deliciously shiver-inducing . . . Fans of dark fantasies such as Neil Gaiman’s Coraline will find this tale irresistible”—from the award-winning author

On Gullstruck Island the volcanoes quarrel, beetles sing danger and occasionally a Lost is born... In the village of the Hollow Beasts live two sisters. Arilou