I've read a lot of really great books this summer, but there's one in particular that I have to recommend to you right now: "Flowers for Algernon".
It's about Charlie Gordon, a harmless, nice guy with an IQ of just under 70. He lives in New York, works in a bakery and tries to "make himself smarter" by attending night classes.
One day, Charlie is picked for an experimental operation. It's supposed to increase his intelligence immensely and it's already been succesfully performed on a mouse named Algernon. Charlie doesn't fully understand any of it, but he's willing to do anything to become more intelligent. Soon after the operation, Charlie starts making progress.
With his heightened intelligence, Charlie starts to remember much more about his past. And he starts to realise, that many people he considered friends are actually cruel and mean to him, which puts him in a depressed and rather cynical state of mind.
Charlie becomes more and more intelligent and soon surpasses the scientists that performed the operation on him. But he also gets mean and snippy and feels betrayed by the world and everyone in it.
The doctors who performed the operation on him also fail to see him as a human being with feelings, which upsets Charlie, who just wants to find his place in the world.
Just when Charlie has finally settled into his new life and come to terms with the life changing operation he has gone through, Algernon starts behaving irrationally. It starts to look like the effects of the operation are wearing off.
I am not going to tell you how it ends, or what actually happens to Charlie and Algernon. What I'm going to tell you is this: It's an awesome book, go read it now, thank me later!