When P.R.O.B.E. is summoned to investigate the savage murder of a retired headmaster, Liz Shaw is disturbed to find evidence of satanic rite near the scene of the crime. She soon discovers a web of deceit and corruption that extends back in time, threatening the current occupants of nearby Winterborne School. With P.R.O.B.E. under threat from within and the death toll mounting, Liz finds herself under increasing pressure from all sides to produce results... The Devil of Winterborne is at large and only Liz can stop it!
| Actor | Role |
|---|---|
 Caroline JohnDr. Elizabeth Shaw | Dr. Elizabeth Shaw |
 Louise JamesonPatricia Haggard | Patricia Haggard |
 Geoffrey BeeversBrian Rutherford / Wittaker | Brian Rutherford / Wittaker |
 Peter DavisonGavin Purcell | Gavin Purcell |
 Terry MolloyDI Burke | DI Burke |
| DDaniel HarcourtChristian Purcell | Christian Purcell |
 Reece ShearsmithAndrew Powell | Andrew Powell |
 Mark GatissGeorgie | Georgie |
| SStephen DolomoreLuke Pendrell | Luke Pendrell |
 Jonathan RigbyCummings | Cummings |
| CCharmian MayMrs. Taploe | Mrs. Taploe |
 Nicholas BriggsMinistry Extra | Ministry Extra |