"99 Percent Mine" is a contemporary romance novel by Sally Thorne, known for her witty writing style. The story follows Darcy Barrett, a strong-willed woman who returns to her hometown to help her twin brother with a renovation project. There, she encounters Tom Valeska, her childhood crush, which complicates her feelings and plans. The novel explores themes of love, friendship, and self-discovery as Darcy navigates her emotions and the challenges of adult life. With a blend of humor and heartfelt moments, "99 Percent Mine" captures the complexities of relationships and the importance of taking risks for love.