The Collector (1965)

Freddie is an inept bank clerk with no future His only hobby is collecting butterflies which gives him a feeling of power and control that is otherwise totally missing from his life He comes into a large sum of money and buys himself a country house Still unable to make himself at ease socially he starts to plan on acquiring a girlfriend in the same manner as he collects butterflies He prepares the cellar of the house to be a collecting jar and stalks his victim over several days