Cummings is suspected of stealing all the radium from his own hospital, and his daughter gets the help of detective Sterling.; The Eagles blow up a German munitions works, but must ditch their planes.; Captain Valor and Big Dip are led into a trap by a girl named Tania, and fall into the hands of Yat Sing, who prepares to execute them.; The mermen beneath the sea, have sent their great wizard, Magi, to America, to bring back a young girl who is their last descendant on earth.; The Scarlet Avenger has come to grips with Texa, a beautiful Amazon, the queen of crime. She will use his powerfull brains in her next crime, to snatch the president.; Nevada Jones is ordered by the governor to catch the train robber, Slade Bowman.; Kalthar is taken prisoner by the Tribe of Shem and taken to their king, Pharoah.; Corn cobs are used to smugglle diamonds.