Marian Hooper Adams--Clover, as her friends called her--was an accomplished photographer and a witty, irreverent free spirit who moved easily within the cultural circles of nineteenth-century Boston. Why, then, in 1882, at the age of forty-two, did she swallow a lethal dose of potassium cyanide? And why did her husband of thirteen years fail even to mention her in his autobiography, The Education of Henry Adams? These and other questions...