Harbinger

"Harbinger. Twice Scott Wolfe has faced this giant of a man. Twice he's barely escaped with his life. If Scott ever hopes to uncover the corruption that is shaping the free world, a confrontation with his most dangerous adversary is unavoidable. Even though Scott has gone underground, it doesn't mean he's alone. He has reconnected with Kathrin, the golden-haired beauty who was with him when it all began. He'd long dreamed of the reunion. But now that Monkey Wrench and Gretel are reunited, something doesn't quite add up. Does he risk the blossoming romance to pry deeper? What if she is a danger to him? Will his emotions leave him blindsided by the truth? Scott keeps driving deeper into the inner workings of the conspiracy, further from his support and closer to danger. Is it too soon for Scott to be on his own? That question might be answered before he's ready for it." ... goodreads.com