This first novel from Nebula Award-winning short story writer Ellen Klages was picked as a Junior Library Guild selection and named a Book Sense #1 Children's Pick. It follows a young girl named Dewey, whose father is part of a super-secret project in 1943 Los Alamos. Dewey, a gifted scientist herself, slowly realizes the implications of 'the gadget' her father is working on. She and Suze, another Los Alamos child, find comfort in each other's friendship. 'An intense but accessible page-turner ... history and story are drawn together with confidence.'-Horn Book Magazine, starred review