Child sexual abuse (CSA) is often unreported and therefore frequently remains undetected and unpunished. Large community-based surveys have consistently identified that undetected CSA far exceeds the rate of cases that are formally adjudicated. This substantial dark figure of CSA is a significant issue that has not yet received the research attention it deserves. Most of the research on CSA is extracted from those who have been arrested and/or convicted for their crimes, but there is more to learn about those who remain undetected for long periods of time. By examining those who have eventually been convicted and have the longest lag between the onset of their offending and eventual detection we can better understand the characteristics that not only facilitate offending but also evasion of the law. This thesis attends to this important knowledge gap by examining the characteristics of men who sexually abused multiple children with substantial lags to detection. This thesis comprises three related studies that each contribute to broadening our understanding of men who have committed persistent extrafamilial CSA over many years.