From the book...

Plunging into a nearby lake on a hot summer day may be one of childhood’s most exhilarating moments, but for a few unlucky swimmers every year the memory of that watery adventure is short lived. For beneath the refreshing waters, the lily pads suspended on slender green stalks, the upraised logs and past schools of fish lurks an unexpected hazard: a tiny nasty strain of amoeba that attacks and kills swimmers by feasting on their brain cells.