Dr. Bartholomew Snow (Rock Hudson), a psychiatrist, is treating a man with emotional problems who, it turns out, is a brilliant scientist being pursued by different international powers and their operatives. Snow soon finds himself caught in the middle and out of desperation, he falls in with a mysterious and beautiful woman named Vicky Vincenti (Claudia Cardinale). But is she helping him, or is she yet another sinister figure out to manipulate him?

Pine Bank Arch, Central Park, Manhattan.

Central Park West and West 72nd Street, Manhattan.

Dalehead Arch, Central Park (West 64th Street) Manhattan.

West 71st Street and Central Park West, Manhattan.

otsoNY Comments: The steps outside number 6 West 71st Street have since been removed, and replaced by a new entry door and small front garden.

6 West 71st Street and Central Park West, Manhattan.