Sienna Cummings is out on an expedition in Montana. She is with her university crew to research a canyon owned by a man named Jesse Blackwolf—an ultrarich hero of the Vietnam War who suddenly fell off the radar in the mid-1970s. What exactly happened? The truth remains unknown. Just when Sienna dazes off, lost in her thoughts about the mysterious hero, she blacks out in the sudden presence of green lightning. Meanwhile, Jesse Blackwolf is twisting his head in confusion. He finds Sienna knocked out on top of a dangerous cliff. Who is this blonde beauty, and where did she come from?