The current: a novel

"When two young women leave their college campus in the dead of winter for a 700-mile drive north to Minnesota, they suddenly find themselves fighting for their lives in the icy waters of the Black Root River, just miles from home. One girl's survival, and the other's death--murder, actually--stun the citizens of a small Minnesota town, thawing memories of another young woman who lost her life in the same river ten years earlier, and whose killer may yet live among them"--