1980, PASS CHRISTIAN, MISSISSIPPI: It is three in the morning when Bobby Western, a salvage diver, zips the jacket of his wet suit and plunges from the boat deck into darkness. His dive light illuminates the sunken jet, nine bodies still buckled in their seats, hair floating, eyes devoid of speculation. Missing from the crash site are the pilot’s flight bag, the plane’s black box, and the tenth passenger. But how? A collateral witness to machinations that can only bring him harm, Western is shadowed in body and spirit—by men with badges; by the ghost of his father, inventor of the bomb that melted glass and flesh in Hiroshima; and by his sister, the love and ruin of his soul. 1972, BLACK RIVER FALLS, WISCONSIN: Alicia Western is twenty years old when she arrives at a psychiatric facility with forty thousand dollars in a plastic bag. A doctoral candidate in mathematics at the University of Chicago, Alicia has been diagnosed with paranoid schizophrenia, and she does not want to talk about her brother, Bobby. Instead, she contemplates the nature of madness, the human insistence on one common experience of the world; she surveys the intersection of physics and philosophy; and she introduces her cohorts, her chimeras, the hallucinations that only she can see. All the while, she grieves for Bobby, not quite dead, not quite hers.