It is 1943, and 11-year-old Dewey Kerrigan is traveling west on a train to live with her scientist father--but no one will tell her exactly where he is. When she reaches Los Alamos, New Mexico, she learns why: he's working on a top secret government program.

"As the dark secrets of Ms. Weaver's past become clear, it's up to Lucy to rally her fellow students into action against the Engineers' evil machinations. But how can she possibly turn the most influential girl in school, Summer, into an ally when she is actually Lucy's greatest enemy? And who is the mysterious apparition from the windmill that comes to Lucy with an ominous warning?" --P [4] of cover.