Keller's Bomb — Lawrence Dunning

FIRST AVON PRINTING. Oct. 1978 mass market paperback, Lawrence Dunning (Fallout!: A Novel). It begins in the American desert, where David Keller, an unassuming young physics student, is kidnapped the day after a deadly load of plutonium is hijacked. The frightening conspiracy involves a courtly Argentinian ex-soldier whose idealism inspires him to do what terrorists do best--create terror, a beautiful spy whose murderous mind honed her stunning body into a fearsome weapon, and a young Sioux Indian survivor on a vengeful mission of his own.- Amazon