First broadcast 20th/27th October 2015.
When College Dean Phil Beskin is found bludgeoned to death with a rock in local woodland, Lewis and Hathaway are called in to investigate.
Martin Wenner - Phil Beskin
Honeysuckle Weeks - Carina Beskin
Daniel Flynn - Jay Fennell
Stephen Boxer - Wouter Eisler
Syreeta Kumar - Annapurna Kinneson
Wil Johnson - Dax Kinneson
Laurence Fox - DI James Hathaway
Sally Scott - Nell Hathaway
Jaygann Ayeh - Nate Hedesan
Isabella Laughland - Gina Doran
Richard Rowe-McGhie - Barman
Kevin Whately - DI Robert Lewis
Clare Holman - Dr. Laura Hobson
Steve Toussaint - Ch. Supt. Moody
Angela Griffin - DS Lizzie Maddox
Serena Evans - Grace Beskin
Bobby Lockwood - Sam Langton
Kaisa Hammarlund - Bex
Chris Cowlin - Police Officer
Rudy Valentino Grant - Ritual Member
Charlotte Mellish - Oxford Student/Cafe Waitress
Steve Saunders - Cult Member
Tamara Sharpe - Oxford Student
Colin Dexter - Customer in coffee shop window
Alex Jaep - Hospital Porter
Paul Greenwood - Father Placid
