Whistle and I'll Come to You (TV)

Professor Parkins, travels to the eastern coast to look at an ancient site for a possible archaeological dig. Parkins does indeed investigate the site where he finds an old metal whistle buried in a patch of broken ground on which is written a phrase in Latin. Parkins translates this as, 'Who is this who is coming?' and blows the whistle. Within hours, the utterly rational Parkins hears the wind whistling outside his room and has terrible dreams of being followed by something or someone unknown. The true horrors have only begun.