This repeat broadcast of Sir Arthur Conan Doyle's short story is a tribute to the late Michael Williams. The culmination of Holmes's life's work is at hand and he prepares to meet his fate and his greatest authority. Dramatised by Bert Coules. with Alan Barker. Terence Edmond , Norman Jones, Richard Pearce, Jane Whittenshaw and Ann Windsor. Violin Leonard Friedman Director Enyd Williams (revised repeat)
BBC RADIO COLLECTION: The Memoirs of Sherlock Holmes , Vols 1, 2 and 3 are available on audio cassette from all good retail outlets and www.bbcshop.com

Clive Merrison as Holmes and Michael Williams (left) as Dr Watson encounter Moriarty in a case that is far from elementary.

Sherlock Holmes - the Final Problem
2.15pm R4 To commemorate the actor Michael Williams, who died in January, Radio 4 broadcasts his favourite story, in which, as always, he plays a splendid Dr Watson. It is an atypical Conan Doyle tale, for Holmes is the potential victim and the great detective's murder the likely outcome. The encounter between Holmes and Moriarty at Switzerland's Reichenbach Falls, which plunge into a tremendous and terrifying abyss, is genuinely awesome. Watson describes his friend after the event as "the best and wisest man whom I have ever known" and this drama is fitting tribute to one our best and finest actors.