Don't get me wrong. This was very amusing fluff, skillfully executed. Frayn is, after all, the author of "Noises Off", so his chops for farce are indisputable. But farce is like souffle - it's fun at the time, but you'll have forgotten it by the next day. Other than the deus ex machina at the end, the story in "Skios" unfolded along completely predictable lines. Nothing wrong with that -- I think part of the pleasure in reading this kind of story is seeing how well the author acquits himself within the relatively rigid conventions of the genre and Frayn does an admirable job.
So this would be an excellent book for the beach, or for the plane. If you are new to Frayn, however, I would suggest starting with "Headlong", a much funnier and more disturbing book.