Hitler's Twin introduces two new characters, Al Phelps and Kathy Hogan, who are joined in the book by Jim Scott and other old friends from earlier books as it progresses. A murder spree leads to terrorism, romances, and later in the book, Jim Scott and friends discover the genesis of the evil men they dealt with in Nohow Robotics. In the strangest of twists, the original murderer is deeply involved in the later problem...without his knowledge.

The book starts with a clue to what is to come, then jumps into the main focus of the early pages of it. While many books have been written on the later developing problem of this novel, none that I know of have even considered the possible explanation that unfolds. When the Chief of British SIS (MI6)-with retirement on the horizon-starts to clean out the desk she has used since becoming Chief, she uncovers information that will lead to the strangest operation of her lifetime.