I've enjoyed the single-minded investigations of Hank Palace, resolutely sticking to his job while society disintegrates around him in the face of an impending and world-ending meteor strike, and World of Trouble rounds out the trilogy nicely. Ben Winters has done a tremendous job balancing light and dark throughout the series and he nails the ending, delivering something that manages to be both uplifting and consistent with the journey we've tagged along on. It's a really clever and well-crafted piece of writing. I can't recommend this series highly enough.