The predecessor to the BBC's A Ghost Story for Christmas series, this 1968 adaptation of M.R. James' story "O, Whistle and I'll Come to You, My Lad" was originally screened as part of the BBC's Omnibus series. It tells the tale of a socially isolated intellectual on holiday (Professor Parkins, played by Michael Hordern) who finds an old whistle while enjoying a coastal walk. After trying the whistle, he experiences increasingly disturbing nightmares which threaten his sanity. (imdb)