“For me, the most compelling and horrifying description of an individual contemplating suicide is found in Graham Greene’s extraordinary personal essay “The Revolver in the Corner Cupboard.” Beset by unmitigated feelings of emptiness in his teenage years, Greene would steal off with his brother’s pistol to Berkhamsted Common and there play Russian roulette: He would insert a single bullet, spin the chamber, press the gun to his head, and pull the trigger. When there was only a click (and there was every time he tried it), he would experience an overwhelming feeling of happiness. “It was as if a light had been turned on . . . I felt that life contained an infinite number of possibilities.”