British crime film directed by Peter Duffell and starring Bernard Lee, Moira Redmond and John Van Eyssen, loosely based on the 1918 novel "The Man Who Knew" by Edgar Wallace.
A gang of jewel thieves rob a house which has just become empty following the recent death of it's rich lady owner. The robbery is not a complete success and one of the gang hides the jewels in the house as he's about to be captured. Later the house is put up for sale and events lead the estate agent to conclude that the jewels may still be there.
