Michael and Jo Richardson are celebrating their wedding anniversary at a secluded country cottage. Jo discovers the body of their friend Edward Fellowes in the bedroom and calls Dr Clarkeson, but finds his behaviour very strange.
| Actor | Role |
|---|---|
 Reginald MarshDet. Inspector Wadcot | Det. Inspector Wadcot |
 Michael StaintonDet. Sgt. Bratby | Det. Sgt. Bratby |
 Ronald Leigh-HuntMichael Richardson | Michael Richardson |
 Toby RobinsJo Richardson | Jo Richardson |
 Peter CopleyDr. Clarkeson | Dr. Clarkeson |
 Gretchen FranklinMrs. Marriott | Mrs. Marriott |
 John GabrielWilliam Ashcroft | William Ashcroft |
 Viola KeatsMrs. Trevington | Mrs. Trevington |
| GGeorge DayP.C. | P.C. |