First broadcast 15th January 2017.
Endeavour is charged with protecting Joy Pettybon, self-appointed guardian of the nation's morals, who is visiting Oxford to promote her 'Keep Britain Decent' campaign.
Sharlette Henry - Mimi
Paul Bown - Rev. Mervyn Golightly
Sylvestra Le Touzel - Mrs. Joy Pettybon
Phil Rowson - Steve Carter
Sophie Simnett - Pippa Leyton
Ella Hunt - Emma Carr
Michael Fox - Ken Wilding
Jonathan Barnwell - Christopher Clark
Dario Coates - Lee 'Stix' Noble
Will Payne - Nick Wilding
William Ilkley - Norris Randall
Pearl Chanda - Bettina Pettybon
Sagar Arya - Dr. Bakshi (as Sagar I M Arya)
Matthew Needham - Dudley Jessop
Shaun Evans - DC Endeavour Morse
Dakota Blue Richards - WPC Shirley Trewlove
David Sturzaker - Ralph Spender
Anton Lesser - Chief Superintendent Reginald Bright
Roger Allam - DI Fred Thursday
Sean Rigby - DS Jim Strange
James Bradshaw - Dr. Max DeBryn
Rebecca Lacey - Mrs. Finch
Kajsa Mohammar - Anna-Britt Clark
David Reed - Julian Calendar
Caroline O'Neill - Win Thursday
Jonathan Cass - Police Officer
Stephen Karl - Crony
Tim Packham - Film Crew
Janette Sharpe - Protestor
Tamara Sharpe - Protestor