Lorelei Lee is a beautiful showgirl engaged to be married to the wealthy Gus Esmond, much to the disapproval of Gus' rich father, Esmond Sr., who thinks that Lorelei is just after his money. When Lorelei goes on a cruise accompanied only by her best friend, Dorothy Shaw, Esmond Sr. hires Ernie Malone, a private detective, to follow her and report any questionable behavior that would disqualify her from the marriage.
With his family away for their annual summer holiday, a publishing executive decides to live a bachelor's life. The beautiful but ditzy blonde from the apartment above catches his eye and they soon start spending time together—maybe a little too much time!
A police detective falls in love with the woman whose murder he's investigating.
