This Sainsbury Centre report details the increasing convergence between mental health and criminal justice, while exposing the differences that do and should exist between the two. It also recognises that too often the way services respond to offenders with mental health problems is inconsistent and disjointed. Too many people are either left to flounder in the gaps between services, or are caught in a “revolving door”. Too frequently, it is only due to the hard work of enthusiastic pioneers that improvements have been made in local areas.