When Beatrix 'Trix' Daley loses her twin brother Bo in a tragic accident, she inadvertently gains his best friend, Penn, whether she wants him or not. Penn is the exact opposite of her brother. Obnoxious. Cocky. And out to sleep with as many women as possible. But he knows. He gets it. Because he lost Bo, too.

Penn's been going out of his way to piss off Trix since he was six. Twenty years later, and getting under her skin is still his favorite pastime. And Bo's still the only thing that keeps them tied together. Even if he has been dead for eight years.

For better or worse, Trix and Penn have been the constant in each other's lives, and the line between love and hate continues to blur at a steady rate...but Trix is the last girl on earth a guy like Penn should fall for. So there's no telling which side of love and hate they'll wind up on when all is said and done. And whether they'll wind up there, still together...or not.