Brassy blonde moll Billie Dawn (Judy Holliday) hits Washington, D.C., with her unscrupulous millionaire sugar daddy, Harry Brock (Broderick Crawford), and his sleazy lawyer,
Theo Wilkins (Edward G. Robinson), a disgraced American science professor, recruits Paul Mason (Rod Steiger), a thief who has recently been released from jail,
Libidinous Hogan (Jack Lemmon) is a landlord who prefers to rent his rooms to attractive single females. Hogan is instantly smitten with a pretty new tenant named Robin (Carol Lynley), but realizes that he'll have to contend with Robin's boyfriend