This is an English horror movie I watched on television in 1990s. One of the scene is as follows:
A man is looking for some treasure in some house. … He digs (or opens some compartment in) the ground, instead finding a skeleton whose right hand is missing. … In place of the skeleton's missing hand, there is a letter (or plaque) with hint about the treasure's real location. … He decides the treasure is behind some large painting. … He opens the compartment behind the painting, finding out the skeleton's missing hand who strangles him to death.