Cleckley, first published in 1941, describing Cleckley's clinical interviews with patients in a locked institution. The text is considered to be a seminal work and the most influential clinical description of psychopathy in the twentieth century. The basic elements of psychopathy outlined by Cleckley are still relevant today. The title refers to the normal "mask" that conceals the mental disorder of the psychopathic person in Cleckley's conceptualization.

    This is a reprint of a revised and enlarged edition, where the author has added important new chapters on Melanie Klein's early work and on technique, as well as a complete chronological list of her publications.