Split Second (1953)

Sam Hurley, "Nation's No. 1 killer" with a cold contempt for "heroes," escapes prison with two companions and takes a mixed bag of hostages to Nevada ghost town Lost Hope City. He knows they won't be found there because an atom-bomb test is planned for next morning! Relationships shift and tension builds as Hurley keeps the others in suspense as to whether he will let them escape before bomb time.