Author of the book 'Unmasking Monsters' Det Sgt (R) David Henwood joins me and we talk about his new book, policing in south Auckland, Operations Park and Harvey, Criminal profiling and what advice would he give a rookie cop these days. Chook served the NZ Police and his community for 37 years in South Auckland before retiring in 2007. He held the rank of Detective Sergeant and was awarded three silver merit awards during his time as an officer.