Here's the premise, direct from the author's website:
7th Son, Book One: Descent is the story of seven strangers who have been brought together after the recent assassination of the U.S. president. These seven men quickly discover they have one disturbing thing in common: They all appear to be the same man, with the same name ... and the same childhood memories.
Unwitting participants in a human cloning experiment, these "John Michael Smiths" have been gathered by their creators for one reason -- to catch the man who murdered the president.
Their target? The man they were cloned from; the original John Michael Smith, code-named John Alpha.
The author has recorded and posted 13 episodes so far (of a planned 24), and if you've got the time and dig sci-fi, check it out!