The half-life of Ruby Fielding : a novel

"Brooklyn, 1942. War rages overseas as brother and sister Will and Maggie Scripps contribute to the war effort stateside. Ambitious Will secretly scouts for the Manhattan Project while grief-stricken Maggie works at the Navy Yard, writing letters to her dead mother between shifts. But the siblings' quiet lives change when they discover a beautiful woman hiding under their back stairs. This stranger harbors an obsession with poisons, an affection...