this is an excellent modern uptake on isaac asimov's psychohistory (from his classic "foundation" series). michael flynn has given the concept a new basis, grounded upon genuine history. the novel is about shadowy competing groups in their attempted use of "cliology" to set the course of history. the book also includes an afterword, chock full of supposedly scientific charts, which purport to prove the theory.
the action is nearly non-stop, from coast to coast, along the lines of david brin's "kiln people" and alfred bester's later works. my only complaint is that an awful lot of key characters get killed along the way.
flynn writes well, and this is a good example of his work.