Well-researched but uneven account of United Flight 232, which crashed in Sioux City, IA, on July 19, 1989, killing 112 of the 296 passengers and crew. The book seesaws between an aeronautical engineering textbook and very graphic descriptions of the casualties. Still, it‘s sobering to learn that the crash resulted from a tiny defect in a fan disk manufactured 18 years before the crash that should have been found during routine inspections.