Whistle And I’ll Come To You (TV Episode) (1968)

This TV episode was part of a UK TV series titled Omnibus. A socially isolated university professor on holiday (Michael Hordern) finds an old bone whistle while walking on a beach. After trying the whistle, he experiences increasingly disturbing nightmares which threaten his sanity. Also stars Ambrose Coghill and George Woodbridge. Also with Nora Gordon and Freda Dowie.