Its landscaped ground, chosen by Frederick Law Olmsted and dotted with Tudor mansions, could belong to a New England prep school. There are no fences, no guards, no locked gates. But McLean Hospital is a mental institution-one of the most famous, most elite, and once most luxurious in America. McLean “alumni” include Olmsted himself, Robert Lowell, Sylvia Plath, James Taylor and Ray Charles, as well as (more secretly) other notables from among the rich and famous. In its “golden age,” McLean provided as genteel an environment for the treatment of mental illness as one could imagine. But the golden age is over, and a downsized, downscale McLean-despite its affiliation with Harvard University-is struggling to stay afloat. Gracefully Insane, by Boston Globe columnist Alex Beam, is a fascinating and emotional biography of McLean Hospital from its founding in 1817 through today. It is filled with stories about patients and doctors: the Ralph Waldo Emerson protégé whose brilliance disappeared along with his madness