Set within the expanses of the American frontier, The Woman in the Trees follows Slainie, an inquisitive pioneer girl, whose life is forever transformed when a mysterious seer shows up at her door. Amidst the backdrop of the Civil War, family tragedy, and the nation's most destructive wildfire, Slainie must navigate her rugged pioneer life as she encounters love and loss, and comes face to face with the story of America's first approved Marian apparition.