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Before taking his musical revue to New York, stage producer Steve Farraugh tries out his new show in Rio de Janeiro, Brazil.  The star of Steve's show, Linda Lorens, is in love with Steve, but Steve still carries a torch for his ex-wife, Vicki Dean, an accomplished stage director.  Band leader Tito Guizar, meanwhile, is smitten with Linda, but she pays him no attention.

Seeking Steve's signature on the final divorce papers, Vicki arrives in Rio with her new fiancée, the staid toothpaste manufacturer John Harbour.  Although Steve has already signed the papers once, Vicki has returned to make certain that he resigns them without using his pen filled with disappearing ink.  While stalling for time, Steve attempts to win back his ex-wife by purposely making the show finale such a flop that she will be unable to resist the urge to fix it.  Vicki, however, sees through Steve's plan to play on her love of show business and demands that he immediately sign the papers.  Despite his best efforts to make a nuisance of himself and scare off John, Steve eventually concedes defeat and grants Vicki's wish.

After signing the papers, Steve hires taxi driver Irkie Bowers to steal them from John and Vicki, along with their plane tickets, just as they are about to leave Rio.  As the police are sympathetic to Steve, Vicki is left with no alternative but to accept his offer of help in exchange for her promise to direct the troupe in rehearsals.  Steve's plan goes awry, however, when Irkie discovers that the check Steve gave him has been signed with disappearing ink.

Irkie returns to Steve's club seeking revenge, and tells Linda about Steve's scheme.  Together, Linda and Irkie search for Steve, who has joined Vicki and John on a sightseeing trip.  Chaos ensues when Irkie tries to take Steve's wallet from him.  The police arrive just as a brawl breaks out, and Steve quickly tosses the wallet into the lap of a Brazilian bystander.  All but Steve are arrested and thrown in jail.  Before bailing out his friends, Steve has a photographer snap a picture of John behind bars.  The resulting international scandal forces John to leave immediately for Buenos Aires to prevent the dissolution of an important business deal.

When the Brazilian man who caught John's stolen wallet tries to return it to its owner, Linda manages to intercept it by telling the man that she is John's wife.  Steve later attempts to take the wallet from Linda, but she insists on giving it to Vicki.  With his scheme now fully exposed, Steve gives up and confesses to Vicki, all the while insisting that his tricks were done in the hope of winning her back.  Steve's fortunes change for the better, though, when he learns that Vicki knew all along that his disappearing ink signature could be brought back to life with lemon juice.  He now realizes that she came to Rio because she loves him.