Society matron Mrs. Livingston Baldwin Crane is selected as a juror in the trial of former chorus girl Yvette Gordon, who’s accused of murdering her rich older husband. In court and during deliberations, Mrs. Crane proves to be a disruptive and unorthodox juror.

Two escaped convicts are found hiding in a rocket ship built by a renegade inventor, who forces them to become the crew for a trip to the Moon. Also on board, as inadvertent stowaways, are his assistant and his secretary; and none of them are aware that the inventor is actually a Lunarian explorer sent to Earth by the dying Lunar civilization.