The reappearance of “Ellen” (Doris Day) after being missing for years—she’d even been declared legally dead—is startling when she returns to society, courtesy of the US Navy, and shows up at her mother-in-law's home. "Grace" (Thelma Ritter) is understandably taken aback, though she seems to have a convenient rug to soften her falls as she processes the news that her son “Nick” (James Garner) isn’t destined for a solitary existence anymore; he has recently married "Bianca" (Polly Bergen). To add another layer of complexity, their honeymoon destination is the very same hotel where they had their initial encounter. Determined to win back her former love, “Ellen” begins searching for them. Predictably, Nick is quite surprised by her arrival, and his legal marriage to a second wife creates a complicated situation for everyone involved, particularly hotel manager "Codd" (Fred Clark), who likely enjoys the most rewarding role as he navigates an unusual scenario of wife-swapping within the confines of his upscale establishment. A series of unfortunate events follows as he attempts to maintain balance. The film poses questions: Does he have feelings for “Ellen”? Does she feel the same? What about "Bianca"? Is there a connection between them? Is “Ellen” truly alive? Can he love her? Is he guilty of bigamy? Initially, it's an amusing and lighthearted experience, but after the initial setup, the plot becomes somewhat tiresome, and the humor started to feel awkward rather than genuinely funny. While Garner and Bergen share a spark, Day and Garner’s chemistry isn’t as strong as what she had with Rock Hudson in "Pillow Talk" (1959). It remains reasonably enjoyable throughout, and the final scene featuring Edgar Buchanan's astonished “Judge Bryson” provides some amusement.

Source on TMDB