A changing climate brings heavy rains to West Texas and gives river guide, Robbie Ducharme, the opportunity to take his clients down a never-before-run desert arroyo.The landscape they enter, the people they encounter, and the relics they find, give these modern-day explorers the thrill of a lifetime. They also threaten Robbie's relationship with the woman he loves and the life of the assistant he admires.In Solitario-The Lonely One, John Manuel asks if we are right to be bold with our lives and the lives of others when the potential rewards are great - or are we venturing where we should not tread?