Paul Britton - long engaged in the clinical research of psychology and the real evidence work of criminal psychology, has an almost mythical status in the crime detection field. The Jigsaw Man was his first-hand narration for some shocking cases he presided over in the past, which also makes this book become a groundbreaking writing on psychological analysis of criminals and judgment reference of criminal cases.

Before reading this book, it is necessary for us to realize that the author of this book is John Douglas. He is a famous FBI agent, engages in the study of criminology, and he has the reputation as the "Modern Sherlock Holmes". At the same time, he is also the prototype of federal agent character Jack Crawford in the film The Silence of the Lambs. In brief, in the fields of crime-analysis and modern criminal investigation technology he has very high reputation and is extremely valuable for catching the foxy serial killers.