"Under One Roof" is a heartwarming contemporary romance novel written by Ali Hazelwood. The book follows the story of two neighbors who start off as enemies but end up falling in love.

The story is centered around a house that is divided into two apartments, and the two protagonists, Poppy and Cooper, live in each of them. Poppy is a young woman with a passion for baking and dreams of opening her own bakery. Cooper is a successful writer with a case of writer's block who is renting the apartment next to Poppy's.

Poppy and Cooper get off on the wrong foot when Cooper criticizes Poppy's baking. They continue to bicker and fight until one day, they find themselves in a compromising position, and things take a romantic turn.

As Poppy and Cooper navigate their new relationship, they must also confront their respective personal issues. Poppy struggles with her confidence and the pressure to succeed, while Cooper is dealing with his writer's block and the fear of losing his successful writing career.

The novel explores themes such as family, grief, self-discovery, and the power of vulnerability. Hazelwood's writing style is engaging and witty, and her characters are relatable and well-developed. The book also features diverse representation, with Poppy being a plus-size woman and Cooper having a disability.

"Under One Roof" is a charming and heartwarming story that will appeal to fans of contemporary romance novels. The book offers a refreshing take on the enemies-to-lovers trope and provides a feel-good message about the power of love and vulnerability.