Night Key (1937)

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  (158 ratings)

In this crime thriller, an old, ailing scientist has been robbed of the burglar alarm he invented by his partner, who owns a security company. The scientist invents a superior alarm to provide for his daughter and sells it to the company for royalties, but his partner refuses to sell it. The… More In this crime thriller, an old, ailing scientist has been robbed of the burglar alarm he invented by his partner, who owns a security company. The scientist invents a superior alarm to provide for his daughter and sells it to the company for royalties, but his partner refuses to sell it. The scientist then invents a device that nullifies his partner's alarms and breaks into stores to prove that it works. He is kidnapped by a gang, who force him to give them the device by kidnapping his daughter. They go on a crime spree, and the scientist escapes and convinces his partner to help him catch the crooks. They rescue his daughter, and the partner pays him in full for all his inventions. ~ Steve Huey, Rovi