Catherine Lemay is a young archaeologist on her way to Montana, with a huge task before her --- a canyon “as deep as the devil’s own appetites.” Working ahead of a major dam project, she has one summer to prove that nothing of historical value will be lost in the flood. And then there’s John H, a former mustanger and veteran of the U.S. Army’s last mounted cavalry campaign, living a fugitive life in the canyon. John H inspires Catherine to see beauty in the stark landscape, and her heart opens to more than just the vanished past.