Weinstein Books, a partnership between The Weinstein Company and The Perseus Books Group, has picked up publishing rights to the novel, said The Hollywood Reporter.
"Happy People" tells the story of Diane, who is still mired in grief after losing her husband and daughter in a car accident.
Searching for a way to remain close to her husband, she takes a trip to Ireland, which he had always wanted to visit, and discovers a possible new love affair.
Weinstein Books will publish the novel in the US in spring, 2016. A film adaptation will be produced by Maeva Gatineau and Sebastien Fechner of Source Films.