'This is the 5th book reporting the world-renowned Cambridge longitudinal Study of Delinquent Development, and in my view the best! We senior scientists who learned our first criminology facts from the CSDD will want to own this book, as will students newly learning criminology. This book is organised for busy readers' convenience, chapters are very concise, and each is summarised with a list of its new findings. Each chapter ends with a list of as-yet unanswered questions about crime; giving readers great ideas for new research projects! This book is brilliant on theory, it masterfully integrates developmental, life-course, and crime-careers theories, making sense of them all. 'Key issues' systematically examines fresh data on onset age, offender prevalence, violence specialization, crime seriousness, career duration, offending frequency, co-offending, chronicity, and developmental trajectories of crime careers. 'Key issues' is the best book about crime I have read in 5 years.' Terrie Moffitt, Institute of Psychiatry