I thoroughly enjoyed Irrefutable. It was something of a detective/mystery novel and had some very good foreshadowing, as well as some interesting plotting, keeping you guessing. Every time you think you're sure of the culprit something comes up that makes you doubt yourself, right up to the conclusion. The book does end a bit abruptly after all of the build up, but the plot arc is resolved at the end, so there were no dangling threads to leave the reader wanting.