The author, Mark John, is a former award-winning detective, having in-depth experience of investigating serious and complex crime, including that of historic child abuse. Becoming Charlie Oscar, the author has shadowed the true inner feelings of how the investigative mind-set of a real-life detective works. This includes the evidential difficulties, frustrations, and the emotional trauma caused not only by the nature of the criminality, but the unnatural and dark psychology of the suspects involved.