This book is primarily intended for Criminology students. It is the author’s modest attempt to lend substantial assistance to Criminology students in understanding—if not attaining adequate knowledge of—the “technical and recondite” subject of Criminal Law, by presenting the basic concepts and important principles/doctrines of the subject as well as the salient provisions of and jurisprudence on The Revised Penal Code Book I. Criminal law, according to Hall and Glueck (“Criminal Law and Its Enforcement”), “is an island of technicality in a sea of discretion.”