Too dark for summer?

I just finished City of Thieves by David Benioff. It takes place in Russia during World War II and the Siege of Leningrad. It is about two young Russian men who are arrested by the Germans and are ordered by a colonel to find a dozen eggs for him in a city that is starving. It is well-written and fast-paced but it felt weird reading about freezing starving people during these humid, sultry days we're having.

I've just started Dark Places by Gillian Flynn, and boy, dark is the word! Dark, creepy, cynical; about a young woman who is the only survivor of her family's murder, except for her brother who (maybe?) did the killing. I like it, but I think I need some chick-lit after this!