The occult whodunit is not an extensive genre, and Stephen King's "The Outsider" is a good example of why.
The first half is a fascinating mystery that challenges fans of detective yarns to be on top of their game. But the second half veers into the supernatural, with the whodunit becoming a whatdunit, and we're subjected to a monstrous — literally — deus ex machina.
King's problem is trying to satisfy two audiences with contradictory expectations. Horror fans want to be shocked; mystery buffs want to deduce the outcome before the author tells us. But just as we're trying to put together the clues to see if we can solve the case, King pulls a bait and switch.
Then again, it's King, so why are we surprised by the arrival of a monster or two? Granted, he's our resident horrormeister, but he has successfully ventured into other genres, including science-fiction ("The Running Man"), prison-escape drama ("Rita Hayworth and Shawshank Redemption") and nonfiction ("Faithful," in which the ardent Boston Red Sox fan chronicled the team's World Series-winning 2004 season). He knows how to analyze the structure and content of various literary forms and then deliver on the template.
And for detective fiction fans, he does a great job of it for the first 250 pages of this book. The plot is built on a fascinating premise: After a brutal murder, both the prosecution and the defense teams have irrefutable proof of their case. What neither side can figure out is how the other side's evidence can be just as ironclad as its own.
The story takes place in a midsize town, where the grisly murder of a young boy appalls people and sets off a frenzy of speculation. The latter hits tsunami proportions when police arrest Terry Maitland, a high school teacher and longtime Little League coach who is — or, at least, had been — considered a cornerstone of the community.
The police are sure they have the killer. His DNA was found in the blood at the scene, and witnesses reported seeing him running from the area. The police are so cocky about their case that they round up Terry without even bothering to find out if he has an alibi. It's a decision they quickly regret.
His alibi turns out to be a doozy. He was at an out-of-town conference with three of his fellow teachers. Not only do his co-workers vouch for him, but there's even a tape showing Terry at a conference meeting held at the same time the murder took place.