In this whimsical filmization of the popular radio series, law student P. Cadwallader Jones (Dennis O'Keefe) bungles his first assignment in the D.A.'s office and is assigned the job of reviewing the closed case of a city official (Peter Lorre) who vanished with a stolen $100,000. The cold case suddenly gets hot when the money begins to reappear, and killings ensue! There are equal measures of mirth and menace in this fast-moving adventure.