"The Rosie Effect" is a heartwarming sequel to "The Rosie Project" that follows the journey of Don Tillman, a genetics professor, as he navigates the challenges of impending fatherhood and strives to be the best partner he can be for his wife, Rosie. Amidst humor and unexpected events, Don's unique perspective and unwavering determination create a story that explores love, growth, and the complexities of relationships.