Coldhearted River recounts the canoe odyssey of Kim Trevathan and photographer Randy Russell down the Cumberland River-almost 700 miles-fromHarlan, Kentucky, through Middle Tennessee and Nashville, then back into western Kentucky, where it spills into the Ohio.The Cumberland presented spectacular gifts to the adventurers: the morning when tiny fog tornadoes swirled gently around their paddles and the night above Cumberland Falls when they built a...