Belle Douleur revolves around the story of Liz, a 45-year-old, single clinical psychologist who finds herself alone and living a very solitary life once her parents have both passed away. Her friends convince her to downsize, and she does so—selling most of the antiques in her house up for sale online. In the process of ‘Marie Kondo’-ing, she meets Josh, a young and attractive antique dealer, and rock musician. Twenty years younger than Liz, Josh was charming and memorable. She finds out that he, too, has been living on his own for years. And, like Liz, Josh has lost family and lives quite a solitary existence. Their loneliness draws them together, and the two soon begin a whirlwind romance.