The book criticizes in detail the work and conclusions of the Warren Commission. Lane questions, among other things, the Warren Commission conclusion that three shots were fired from the Texas School Book Depository and focuses on the witnesses who had recounted seeing or hearing shots coming from the grassy knoll in Dealey Plaza. Lane questions whether Oswald was guilty of the murder of policeman J.D. Tippit shortly after the Kennedy murder. Lane also states that none of the Warren Commission firearm experts were able to duplicate Oswald's shooting feat.