Lake in the Clouds (Wilderness #3) by Sara Donati

In her extraordinary novels Into the Wilderness and Dawn on a Distant Shore, award-winning author Sara Donati deftly captured the vast, untamed wilds of late-eighteenth-century New York and the trials and triumphs of the spirited Bonner family. Now she takes on a new chapter in the life of Elizabeth and Nathaniel Bonner--as their brave and beautiful oldest daughter comes of age with a challenge that will change her forever. . . .