A soldier returning from World War II finds love with a lady swimmer.

While working at a city pool in Los Angeles, swimming instructor Cynthia Glenn catches the attention of Robert G. Delbar, a visiting businessman. Robert falls instantly in love with Cynthia and embarks on an aggressive campaign to win her affections. He begins by sending a bouquet of flowers every day to Cynthia's home, where she lives with her absentminded aunt Nona and her uncle Hobart. Robert takes Cynthia to the horse races, the ice follies and fancy restaurants until she finally succumbs to his persistence and consents to marry him. Following the wedding, Robert and Cynthia take their honeymoon in the mountains, at the Hotel Monte Blava, but Robert is forced to leave on business a short time after they arrive. Left to entertain herself at the resort, Cynthia befriends Nils Knudsen, the kindly star of the Metropolitan Opera. Nils, who is on a strict weight loss diet, dines at the hotel under the watchful eye of his sweetheart, Sarah Fenway, who is also the manager of the hotel. Cynthia also befriends Major Thomas Milvaine, a celebrated young war hero, and Maude Bancroft, the daughter of the businessman accompanying Robert to Washington. As the days pass, Cynthia teaches Thomas how to swim, while he regales her with war stories and accompanies her on mountain hikes. Meanwhile, Nils repeatedly tries to cheat on his diet, and even refuses to sing with Tommy Dorsey's orchestra unless the band leader brings him a steak. Though preoccupied by his appetite, Nils finds time to counsel Cynthia, who has fallen in love with Thomas. As the day of Robert's return approaches, Thomas and Cynthia grow increasingly frustrated that their brief romance will soon end. Maude, who is also aware that Cynthia and Thomas have fallen in love, secretly arranges a week-long delay to Robert's return, but the delay makes their inevitable separation all the more painful. One afternoon, Cynthia sets out for a solitary hike in the mountains to take her mind off her heartbreak, but Thomas finds her in the woods and joins her. As night approaches, the two hikers realize that they are lost, and decide to camp in the woods overnight and try find their way back to the hotel in the morning. Meanwhile, back at the hotel, Nils is overjoyed when he meets a doctor who tells him that he can forget his diet and eat and drink just about everything he desires. When Robert returns to the hotel the following morning, he discovers that his wife did not sleep in her room the previous night, and angrily accuses Cynthia of infidelity when she returns with Thomas later in the day. Cynthia calls Robert a "stuffed shirt," and later admits that she is in love with Thomas. After agreeing to an annulment, Cynthia moves back home to be with her aunt and uncle. Nils, realizing that he must help reunite Cynthia and Thomas, arranges a romantic serenade for Cynthia outside her aunt and uncle's house. With vocal help from Nils, Thomas captivates Cynthia with a song, and the resumption of their romance is all but assured.