04 1. Introduction: Revealing an ''Eleusinian Mystery''  2. ''Men of Known and Approved Fidelity'': The Development of the Bow Street System  3. ''If the Gentleman Writes, the Gentleman Pays'': The Employers of Principal Officers  4. ''Contending with Desperate Characters'': The Types of Crimes Investigated by Principal Officers  5. ''Police Officers for the Country at Large'': The Nationwide Role of the Principal Officers, 6. ''Domiciliary Visits, Spies, and all the rest of Fouche''s Contrivances'': Six Case Studies of Provincial Investigations by Principal Officers   7. '' More Expert in Tracing and Detecting Crime'': The Post-1829 Situation  8 . ''Rescuing from an Historical Cul-de-sac'': The Legacy of the Bow Street Principal Officers.  References