Right from the beginning, you can tell he needed a plumber—just look at his sink! Maybe a cleanup crew would have been useful as well. With some important guests expected for a party, it was essential that "Hilary" (Reginald Gardiner) get someone to fix it. When the doorbell rings, he thinks “Belinski” (Charles Boyer) must be the plumber. Even though he feels bad for him, he admits he can’t do the job himself. Another ring reveals the titular handy-woman. A wrench, a hammer, and some muscle power later, they're sharing a drink to celebrate. Her uncle—the actual plumber—shows up and finds her confused, so he decides she needs to go to the countryside for a respectable position as a lady’s maid. Without her knowing it, she ends up at the home of "Sir Henry" (Reginald Owen) and "Lady Alice" (Margaret Bannerman), where “Belinski”—a writer escaping Nazi persecution in Czechoslovakia—is also staying as a guest of their rather naive son, "Andrew" (Peter Lawford). “Cluny” is quick-witted and doesn’t easily accept the usual subservient role, so her more perceptive fellow visitor tries to help her out, questioning many traditional social customs while completely falling for the young woman. She has plenty of men interested in her—like Richard Haydn as the pompous "Wilson"—and he does too, but can they both figure things out before his train back to London leaves? Boyer and Jones are both relaxed and engaging here, delivering a touching script that weaves their mistakes and confusion into something with a message about social class, though it handles the subject delicately. Owen is also quite good at this, and Cyril Mockridge’s cheerful music fits well with the generally pleasant and sophisticated feel of the film.

Source on TMDB