He is one weird Christmas visitor-his hair and moustache an unearthly white-blond, his voice a gruff rumble. He fills the apartment doorway. From two metal cases he produces what a boy would expect from an exterminator: Toxic roach powders and poisonous fog bombs. But a crossbow? Eric is fascinated at first. He's been bored this snowbound vacation, and has already zapped about a zillion Zergs. Antsy, he's even sneaked a look at the Christmas presents hidden beneath his parents' bed. Then Anje Gabrail, this exterminator, appears, talking a little madly about his war against rats-about killing them. "The worst," Anje says. And if Eric sees one in the Eden Apartments, he is to call Anje's twenty-four-hour cell phone immediately. Later that Monday, the fourth day before Christmas, a rat does appear in the building's basement-and Eric finds himself suddenly, frighteningly swept into Anje's vengeful army. As either partner...or victim. With only a flashlight.