First broadcast 16th August 1974.<br /><br />A popular member of the Oxford community is killed, and nobody can think why.<br /><br />Stanley Baker - Detective Inspector Jamieson<br />Denis Lill - Sgt. Beck<br />David Swift - Insp. Havelock<br />Derek Francis - Octavius Lamb<br />Barbara Leigh-Hunt - Madeleine<br />Simon Fisher-Turner - Steven (as Simon Turner)<br />Peter Sallis - Lloyd<br />Artro Morris - Mr. Humber<br />Gillian Raine - Miss Bennett<br />Michael Hawkins - Bardon<br />Ingrid Hafner - Mary<br />Bruce Boa - Professor Friedland<br />Cyril Shaps - Mr. Lavender<br />Shelagh Wilcocks - Mrs. Lavender<br />Honora Burke - Mrs. Bute<br />John Challis - Casson<br />Anthony Roye - Doctor Robson<br />Ève Karpf - Miss Compton<br />Anthony Bailey - Sgt Latimer<br />Miles Anderson - P.C. Hanworth<br />Dennis Blanch - P.C. York<br />Cheryl Hall - Amy<br />Colin Edwynn - Michael<br />Mona Hammond - Nurse<br />Melinda Sheridan - Receptionist
