Gentlemen Prefer Blondes

Lorelei intends to marry Gus Esmond Jr. in France, but Esmond Sr. forbids their travel. Undeterred, Lorelei decides to go anyway, hoping to meet Gus later despite the warning. Gus provides a letter of credit to cover her expenses and promises to meet her in France.

To safeguard his son's future, Esmond Sr. hires private detective Ernie Malone to spy on Lorelei and uncover any misdeeds. Malone's mission casts a shadow over Lorelei as the voyage begins. The stakes are raised by the prospect of scandal.

On the Atlantic crossing, Malone immediately falls in love with Dorothy, while Lorelei is drawn to the wealthy Sir Francis 'Piggy' Beekman. Dorothy's attention settles on the male Olympic-team members aboard, setting up a romantic tangle. The ship becomes a backdrop for flirtation and scheming.

Lorelei invites Piggy to the cabin she shares with Dorothy, where he recounts Africa travels. Malone spies through the window and photographs them, but Dorothy sees him. They hatch a plan to intoxicate Malone and search him for the incriminating film.

The trio finds the film in Malone's pants, and Lorelei prints and hides the negatives. She then persuades Piggy to give her Lady Beekman's tiara, leveraging the scandal to advance her social ambitions. The episode showcases Lorelei's willingness to exploit secrets for advantage.

Malone reveals that he planted a recording device in Lorelei's cabin and implies she is a gold digger. He also admits to being a liar, complicating everyone's trust. Dorothy then reveals she is falling for Malone, further entangling loyalties and desires.

The ship arrives in France, and Lorelei and Dorothy begin shopping and adjusting to new surroundings. They discover that Lorelei's letter of credit has been canceled, and Malone's information has led to them being evicted from their hotel.

With finances strained, Lorelei and Dorothy take jobs as showgirls in Paris, headlining a lavish revue. Lorelei performs Diamonds Are a Girl's Best Friend and briefly encounters Gus at the show, whom she rebuffs as she pursues a new life.

Lady Beekman files charges over the missing tiara, and Lorelei is arraigned for theft. The social scandal deepens as investigators search for the missing jewelry and the truth behind the supposed theft.

Dorothy disguises herself as Lorelei in court to stall an unmasking, mimicking her friend's voice and mannerisms. Malone moves toward exposing Lorelei, but Dorothy uses covert language to protect her friend and express her own feelings for Malone. The ploy buys time and shifts the courtroom dynamics.

Malone confronts Piggy at the airport, catching him in a moment of denial about his involvement. The confrontation reveals Piggy's complicity in the tiara affair and helps clear Lorelei's name.

Back at the nightclub, Lorelei delivers a persuasive speech praising paternal money and the idea of a daughter's future, winning Esmond Sr.'s reluctant consent. A double wedding is held for Lorelei and Dorothy with their respective grooms, sealing the unions that started as schemes but end in approval.