Suicide is a complex human behaviour that remains one of the leading causes of death worldwide. Although suicidal behaviour continues to perplex clinicians and scholars, there have been recent advances with regard to the research related to the understanding, assessment, and biopsychosocial treatment of suicidal individuals, as well as the prevention of suicidal behaviour. This volume combines the efforts of several leaders in the field of suicidology in an attempt to grasp a better understanding of why people have suicidal thoughts, engage in suicidal behaviour, and ultimately die by suicide. The book is divided into four major parts and provides a comprehensive summary of the exciting progress being made in the field of suicide prevention. Part I discusses epidemiology, epigenetics, and theories of suicide. Part II focuses on assessment, prevention, intervention, and postvention. Part III examines suicide in special populations. Part IV explores suicidal behaviours in psychological disorders. This unique and comprehensive book is intended for graduate students, researchers, clinicians, and professionals who may encounter issues relating to suicide on a regular basis.