Anyone read "Killing Lincoln" by Bill O'Riley?

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What is it about? Well, I know it is about Lincoln's assination, but can't get to much more than that...anyone read it and can give a decent "book report" about it? I hate buying expensive books only to find they aren't worth the paper, muchless my dollar. And I hate buying and not knowing what it is about. It was No.1 for weeks and weeks, although I guess that doesn't mean it was great...just that people bought it! Doesn't mean they liked it!!! Appreciate any reviews.