Alternatives

Ren Madkro experienced an accident that sent him to a parallel-alternate reality and left him with a parallel mystery that he had to solve. Lost in another parallel Earth, where humanity, technology, and civilization have evolved quite differently, Madkro had only 3 things going for him to help him survive: his secret knowledge about the alternate technology, the girlfriend he had lost in the original version of Earth, and a mysterious genius who shared secret knowledge with him in the past.
Along with those things, he had nothing more than his instincts and experience with the dangers of cloak and dagger to keep him alive.