Unfathomable

Danny's eyes widened, remembering the day that he returned home from wherever he had been kidnapped. He had returned emaciated and smellier than a homeless drug/alcoholic, but all that he remembered before that was darkness, and a numbing cold that had haunted his nightmares even months after escaping. He didn't remember who had taken him, or what they had done to him, but the scars that littered his body remained his only clue.

Cover art is not mine. I just saw it and thought it wAs funny and fit this sequel so well.