Three years with the rat

"After several years of drifting between school and go-nowhere jobs, a young man is drawn back into the big city of his youth. The magnet is his beloved older sister, Grace: always smart and charismatic even when she was rebelling, and always his hero. Now she is a promising graduate student in psychophysics and the center of a group of friends who take "Little Brother" into their fold, where he finds camaraderie, romance, and even a decent job"--Jacket flap.