It is 1910, the age of flying machines is still in its infancy, and newspaper publisher Preston Whiteway is offering $50,000 for the first daring aviator to cross America in less than fifty days. He is even sponsoring one of the prime candidates-an intrepid woman named Josephine Frost-and that`s where Bell, chief investigator for the Van Dorn Detective Agency, comes in. Frost`s violent-tempered husband has just killed her lover and tried to kill her, and he is bound to make another attempt. Bell has tangled with Harry Frost before; he knows that the man has made his millions leading gangs of thieves, murderers, and thugs in every city across the country. He also knows that Frost won`t be only after his wife, but after Whiteway as well. And if Bell takes the Frost will be after him, too.