18:00Arthur Conan Doyle - Professor ChallengerEpisode 2: The Disintegration MachineBBC Radio 4 Extra Duration: 30 minutes Fri 18th Dec 2015, 18:00 on BBC Radio 4 ExtraSir Arthur Conan Doyle's indomitable academic must investigate dastardly Latvian scientist Theodore Nemor. Stars Bill Paterson.GenresDramaSeriesArthur Conan Doyle - Professor Challenger Source: BBC Online