It stars Peter Vaughan as Paxton, an amateur archaeologist whose attempt to track down one of the three legendary crowns of East Anglia causes him to be followed by the ghost of its last guardian, William Ager (John Kearney).

[6] Clark noted in a 2014 interview that he tried to make A Warning to the Curious as "essentially, a silent film, with the tension building slowly throughout the visual images".

[8][9] Clark recalls filming in North Norfolk in late February, with consistently fine cold weather "with a slight winter haze which gave exactly the right depth and sense of mystery to the limitless vistas of the shoreline there.

In 2022 it was remastered in 2k resolution by the BFI and released on Blu-ray alongside "Whistle and I'll Come to You" (1968 and 2010), "The Stalls of Barchester", and "Lost Hearts" (1973) as Ghost Stories for Christmas - Volume 1.

[15] This included Adam Easterbrook's essay, the Lawrence Gordon Clark introduction, and a newly-recorded commentary by TV historian Jon Dear.