Advertising executive mistakenly identified as non-existent spy George Kaplan. Framed for murder, he goes on the run, teams up with Eve Kendall, survives a crop duster attack, and ultimately helps capture the villainous ring at Mount Rushmore, ending up married to Eve.
The Professor utilizes Thornhill to advance the USIA's operation against Vandamm.
A romantic bond develops between the fugitive and the undercover agent.
Vandamm orchestrates the conspiracy that frames Thornhill, leading to their final showdown.
Townsend attempts to murder Thornhill after mistaking him for a spy.
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