Following the death of the man who had given him a home for most of his life, gardener Chauncey (Peter Sellers) suddenly finds himself without a place to live. Wearing his best inherited suit and carrying everything he owns in a suitcase, he enters the world completely unprepared. He’s broke, has no place to stay, nothing to eat, and no friends. It's as if he's an adult with only television as his understanding of reality. Fortunately, he encounters Shirley MacLaine’s character, Eve, while she is in a limousine, and she brings him back to her large house to recover. She finds something appealing about his straightforwardness, though not as much as Melvyn Douglas’s character, Benjamin, does. He's like a "Daddy Warbucks" type—extremely wealthy with considerable political power, even reaching the President (Jack Warden). Their conversations with Chauncey largely use nature as a reference point: planting and harvesting, nurturing, seasons, good times and bad – all of which resonates with the millionaire as he begins to understand in very simple terms those essential harmonies that maintain society—and the economy. As this man's positive influence grows, so does Eve’s affection for him, and the interest from security agencies who can’t find any record of his existence. He doesn’t even seem to have a birth certificate; is he as genuine as he appears, or has the CIA been erasing records without informing the FBI? It's Sellers’ subtle depiction of an innocent that makes the film touching and thought-provoking. The movie questions beliefs, stereotypes, and attitudes without being confrontational. Chauncey encourages viewers to see the world through his perspective, which is quite revealing regardless of one’s moral standing. There’s also a sense of lightness in this film that doesn't come from obvious jokes but rather from the actions of an adult untouched by cynicism who may be the salvation many were—unintentionally—hoping for. While Sellers dominates the movie, Douglas provides a very compelling and relatable contrast, and MacLaine, Warden, and Ruth Attaway’s witty Louise offer strong support, making this a moving film about faith—in various forms.

Source on TMDB