Just finishing up Tom Rob Smith's 'Agent 6' (the final part of the Leo Demidov trilogy - started with 'Child 44'), and sadly pretty disappointed. It gets good in the latter half of the book, but the first 250 pages are pretty underwhelming, particularly in comparison to 'Child 44' or 'The Secret Speech.'
Also reading Tana French's 'In the Woods,' and while I've heard that her conclusions often leave something to be desired, I'm loving it so far. She's a phenomenal writer.
If you're looking for an entertaining summer read, Emma Donoghue's 'Room' is excellent, and certainly the best of my 'summer reads' this year (though if you're like me, you'll probably get through it in a day or two).