In his dedicated pursuit of technology that will aid pilots to safely "fly blind" during adverse conditions. aerial innovator Ken Gordon is literally blinded in an accident, but this setback doesn't deter him from his goal.
As a youngster John Wyatt saw his parents killed and his brother kidnapped. On a wagon train heading West he meets his brother who is now a spy for the gang which originally did the dirty work. He and his brother both fall for Mary Gordon.
Wealthy Edward Morgan becomes charmed with a curly-haired orphan and her pretty older sister Mary and arranges to adopt both under the alias of "Mr. Jones." As he spends more time with them, he soon finds himself falling in love with Mary.
A man in London tries to help a counterespionage agent. But when the agent is killed and the man stands accused, he must go on the run to both save himself and also stop a spy ring which is trying to steal top secret information.