Book excerpt: The fourth Nathan Active mystery Alaska State Trooper Nathan Active must figure out what connects a dead hunter on a remote Arctic lake with a year-old fatal plane crash in the Brooks Range and an arson at the Chukchi Recreation Center. That fire killed eight people, including the police chief and the town’s basketball star. Active’s investigation leads him to a lucrative polar-bear poaching operation and a brother and sister with an intense bond from a village famous for twins, polar bears, and schizophrenia.