This book explores sexual crime and intellectual functioning. Drawing on expertise from clinical practice and applied research, the volume begins with an exploration of the theoretical and historical background to the interest in links between sexual offending and intellectual functioning. The authors then move on to discuss assessment of intellectual functioning in prison, interventions for low intellectual functioning, autistic spectrum and personality disorder. This book offers a rare insight into the phenomenon of high IQ and sexual offending, a much neglected aspect of the sexual crime literature, and includes novel research that unpacks this link. It further offers an extraordinary insight into the experiences of a person of superior IQ in the criminal justice system for a sexual offence.  The book is relevant not only to psychologists, criminologists, social workers and students, but also to practitioners, researchers and the general public with an interest in learning about sexual offending and intellectual functioning.