Laura Miller over at Salon suggests two mystery books for summer reading, Claire Dewitt and the City of the Dead by Sara Gran and The Hypnotist by Lars Kepler. Check out her reasoning at this link. Coincidentally, I just started reading Claire Dewitt last night; 40 pages into it and I'm hooked.
If you are looking for more mysteries to pack into your beach bag, check out Chris Knopf's series set in the Hamptons and featuring Sam Acquillo. Over the weekend I finished Black Swan, in which Acquillo uses his engineering background and boxing skills to sort out skulduggery on an island in Long Island Sound. I've greatly enjoyed reading all the books in this particular series. Knopf created a unique and engaging character in Sam Acquillo and the books are entertaining and smart.