Consumer psychologist Sienna Lambert has built a successful business, but she's in serious need of "letting her hair down." Clearly beautiful behind her thick glasses and tight bun, Sienna seems intent on keeping men away...but why? Then Vaughn comes into Sienna's life and knocks her over—literally, during a softball game as he tries to get to the base she's blocking. The two become fast friends, and soon their friendship blossoms into a romance. But Sienna has a secret she hasn't shared, a troublemaking twin sister, Sasha, who's been out of the picture for years. Except now Sasha's back and intent on making waves for Sienna in any way she can. Can the rift between the sisters be fixed, or will it end up costing Sienna everything?