Fifteen-year-old Nix Humbolt both loathes and adores his older sister, Roxy. He loves her vibrancy, but hates her choices, especially her latest one--going after scumbag Bryan Sykes. She won't listen to him, and that seems like the end of the matter. Needing to fight a battle he can win--besides ones on his video games--Nix decides to rescue Twig, a neglected dog.