"Dr. Niles Nelson, an inveterate horse player, is lured by the promise of easy money into becoming doctor to crime boss Joe Gurney and his gang. When Niles is killed by the police while attending to one of Gurney's men, his wife, Dr. Carol Nelson, falls under suspicion of also being in league with the gangsters. Under threat of having her license revoked, Carol is desperate to establish her innocence, and sets up her medical practice in the small...

[The black dragons] "Just prior to the start of World War II, a doctor operates on six Black Dragon Society Japanese operatives and transforms them into exact duplicates of six high-ranking American businessmen who are replaced by these look-alikes. With their operatives in place, a plan to sabotage the American war effort appears to be set." [The invisible ghost] "Bela Lugosi stars in this Monogram thriller as a man living with his daughter while...