the suspense would be in the identity of the killer and whether he could be stopped before he strikes again which is exactly fitting the definition of the genre however king does a poor job of denoting it so it may not work for some readers to call it so and perhaps if the reader hasn't been spoiled by the internet the suspense factor would have been more prominent till the perpetrator old son of a gun wally is revealed though of course it doesn't make sense that the particular perpetrator would have been likely to commit such a crime accidentally and tried to cover up what he did in order to undo the event which option he has always staunchly opposed. ultimately perhaps it's a poor example of a suspense thriller but the elements are present even if you choose to turn a blind eye towards it or you do not feel that the narrative worked particularly in depicting so.