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Edward, the manager of opera composer Victor Albert, is preparing the Alpen Hotel for Victor's upcoming visit.  As Edward rehearses the staff, Victor stops his car down the road from the hotel.  After warning his driver Joseph that no one, especially his wife, prima donna Anna Hoefel, must know he is there, Victor continues his journey in a horse cart and is given a melodious welcome at the hotel.  American mousetrap salesmen Stan Laurel and Oliver Hardy are also in town.  They have come to Switzerland under the delusion that they will be able to sell more mousetraps where there is more cheese and therefore more mice, but they are having little luck.  Blinded by thoughts of their encroaching poverty, the boys are easily swindled by Emil, a cheese factory owner, into selling him their entire stock for 5,000 Bovanian francs.

It is not until after a large dinner at the Alpen Hotel that the boys find out the money is worthless, and thus begins their employment as the hotel's dishwashers.  A few days later, Anna arrives, and Victor tells her that he is writing an opera about a Tyrolean peasant girl that will establish him as a great composer, as his talent has been ignored in favor of her singing.  She wants to sing the lead in his new opera, but he believes that she could never play a simple girl whom a peasant could love.  Anna sits pouting in the lobby when she meets Stan and Ollie, who tell her their story of being forced to work in the hotel, and she uses the same technique to stay on as a chambermaid.

Later, Stan and Ollie are plucking chickens outside when Stan sees a St.  Bernard dog with a barrel of brandy.  Ollie explains to him that the brandy is only for emergencies, but Stan uses the chicken feathers to trick the dog into thinking that he is buried in snow, and a triumphant Stan is soon drunk.  Meanwhile, Victor is distracted by Anna's presence and commands Edward to find him a quiet work place.  Edward arranges for Victor to work in a remote treehouse, accessible only by a bridge suspended over a deep ravine.  When Stan and Ollie arrive at Victor's room to move his piano, Anna makes a point of showing Victor that they adore her.  The boys manage to push the piano up the mountain to the bridge, but while trying to cross it, they are chased by a gorilla.  The bridge breaks, and while Stan and Ollie save themselves, the piano and gorilla tumble down.

Back at the hotel, Anna flirts with Chef Franzelhuber and then Ollie to make Victor jealous.  That night, the boys serenade Anna, and Ollie asks her to attend the Alpen Fest with him the next day.  After telling them that she has a plan for the festival, she retires, and Franzelhuber, awakened by the racket, warns them that Anna is his and that there will be dire consequences if they do not leave immediately.

The next morning, Stan, Ollie and Anna arrive at the Alpen Fest disguised as gypsies, with Anna intent on wooing Victor with her singing.  Victor recognizes her and asks Edward to bring her up to his room.  Stan and Ollie wait outside Victor's room while she goes inside, but the chef appears and they lead him on a merry chase.  When they return to Victor's room and force their way in, they discover that the happily reunited couple are husband and wife.  Disheartened, Stan and Ollie leave the hotel, and as they are walking away, the bandaged gorilla chases them, throwing his crutch at them.