Iris and Lark are identical twins whose differing personalities and styles fit together perfectly. Iris is practical, logical, and outspoken. Lark is a dreamer, artistic, and shy. Their inseparable status is threatened, however, when they are assigned to different fifth-grade classrooms. Iris is sure it's a mistake, but the girls' parents and principal are resolute that separating Iris and Lark will help them grow as individuals. Narrated by a nameless third party, the story belongs primarily to Iris, who believes it is her job to protect Lark, and she works herself into knots over being suddenly unable to do so. For the first time, she finds herself keeping secrets and telling Lark lies, hoping to shield her sensitive other half from unpleasantness. Meanwhile, Iris finds refuge in an antique shop with a cryptic sign and even more curious owner, whose empathy with Iris' situation is revealed to be unspeakably sinister. Anger, confusion, and loneliness muddle together as Iris realizes she can only escape her dire predicament by letting Lark take charge. National Book Award nominee Ursu laces her story with fairy-tale elements and real-life monsters, while taking great care to cast girls in an empowering light and as authors (and heroes) of their own stories. It is a layered, mysterious tale that will speak to many and brushes the world with magic.--Julia Smith Copyright 2019 Booklist