New York's Odyssey Detective Agency is hired by two different clients to follow two women suspected of infidelity. Ladies' man John Russo (Ben Gazzara) trails Angela Niotes (Audrey Hepburn), the elegant wife of a wealthy Italian industrialist, while Charles Rutledge and Arthur Brodsky follow Dolores Martin (Dorothy Stratten), the beautiful young wife of a jealous husband. Their respective cases are complicated when John falls for Angela, and Charles falls for Dolores.

Manhattan Bridge, East River, Lower Manhattan.

Downtown Manhattan Heliport, Pier 17, Manhattan.

Public School 40, 320 East 20th Street (btw 1st & 2nd Avenues) Manhattan.

2nd Avenue and East 20th Street, Manhattan.

Music Box Theatre, 239 West 45th Street (btw 7th and 8th Avenue) Manhattan.

Shubert Alley and West 45th Street, Manhattan.

Algonquin Hotel, 59 West 44th Street and 6th Avenue, Manhattan.

Shoe Shop, 677 5th Avenue and East 53rd Street, Manhattan.

The Plaza Hotel, 750 5th Avenue and Central Park South, Manhattan.

5th Avenue (btw West 57th and 56th Streets) Manhattan.

Dolores's Brownstone, 40 West 12th Street (btw 5th & 6th Avenues) Manhattan.

West 12th Street (btw 5th & 6th Avenues) Manhattan.

New York County Supreme Court, 60 Centre Street, Manhattan.

Office, 120 South Street (btw Wall Street and Pine Street) Manhattan.