Dr. Allan Fields (Ray Milland) is a nuclear physicist who works for the Atomic Energy Commission in Washington D.C. Fields is also a spy working for an unnamed foreign power. Through a series of elaborate devices and plans, Fields takes secret photos of his top-secret work and passes the secrets, through a vast network chain in New York City, to an apparently enemy country. The latest canister of microfilm the doctor sends out is picked up by authorities after the courier is killed in a traffic accident in Central Park with the documents in his possession.

Broadway and West 34th Street, Manhattan.

Macy's Store, 151 West 34th Street (btw 6th and 7th Avenues) Manhattan.

Times Square (Broadway, 7th Avenue, West 42nd and 47th Streets) Manhattan.

Pennsylvania Station, 7th Avenue and West 31st Street, Manhattan.   The Original Pennsylvania Station Pennsylvania Station (commonly known as Penn Station) is the major intercity train station and a major commuter rail hub in New York City. It is one of the busiest rail stations in the world, and a hub for inboard and outboard railroad traffic in New York City. The New York City Subway system also has multiple lines that connect to the station. The station is located in the underground levels of Pennsylvania Plaza, an urban complex located btw 7th Avenue and 8th Avenue and btw 31st Street and 33rd Street in Midtown Manhattan. Pennsylvania Station is named for the Pennsylvania Railroad (PRR), its builder and original tenant, and shares its name with several stations in other cities. The current facility is the substantially remodeled underground remnant of a much grander structure designed by McKim, Mead, and White and completed in 1910. The original Pennsylvania Station was an outstanding masterpiece of the Beaux-Arts style and one of the architectural jewels of New York City. The station's air rights were optioned in the 1950s. The option was executed soon after. The option called for the demolition of the head-house and train shed, to be replaced by an office complex and a new sports complex. The tracks of the station, which were located well below street level, would remain untouched. Demolition began in October 1963. The Pennsylvania Plaza complex, including the fourth and current Madison Square Garden, was completed in 1968.

Central Park West and West 72nd Street, Manhattan.

Park Avenue and East 34th Street, Manhattan.

Empire State Building, 350 5th Avenue and West 34th Street, Manhattan.

Floor 102, Empire State Building, 350 5th Avenue and West 34th Street, Manhattan.

Wall Street and Broad Street, Manhattan.

Centre Street and Worth Street, Manhattan.