Seven years ago, readers around the country fell in love with a singular American voice: Rinker Buck, whose infectious curiosity about history launched him across the West in a covered wagon pulled by mules and propelled his book about the trip, The Oregon Trail, to ten weeks on the New York Times bestseller list. Now, Buck returns to chronicle his latest incredible adventure: building a wooden flatboat from the bygone era of the early 1800s and journeying down the Mississippi River to New Orleans. A modern-day Huck Finn, Buck casts off down the river on the flatboat Patience, accompanied by an eccentric crew of daring shipmates. Over the course of his voyage, Buck steers his fragile wooden craft through narrow channels dominated by massive cargo…