Twenty years ago, a toxic spill in the small, southwest Texas town of Exile poisoned residents with permanent rage. The feds' response? Quarantine. Only residents who pass the feds' 4-S test can escape Exile's heavily fortified borders. Heidi Palermo, unwilling medic to her family of bloodthirsty street warriors, has taken the test repeatedly, trying to prove she's smart, strong, sterile, and sane. Three out of four ain't bad, but the feds don't grade...