Marina Cohen's A Box of Bones is a dark, propulsive, middle-grade tale about a trick box, two worlds entwined, and a mystery that may be best left unsolved. Twelve-year-old Kallie despises nonsense. She believes there's a rational explanation for everything, despite the good-natured prodding of her Grandpa Jess, who takes her to frivolous wastes of time like their town's local Festival of Fools. There, Kallie meets a faceless...