The Root of All Evil is a 1947 British drama film, directed by Brock Williams for Gainsborough Pictures and starring Phyllis Calvert and Michael Rennie. The film was the first directorial assignment for Williams, who was better known as a screenwriter, and also produced the screenplay based on a novel by J. S. Fletcher.
Seeing a possible payday as compensation for her disappointment, Jeckie sues Albert for breach of promise and emotional distress, and after she plays up her status as jilted victim in court she is awarded a considerable sum in damages. Seeing the chance for revenge, she uses her windfall to set up her own grocery store, directly opposite that of the Grice emporium. By undercutting on prices and offering customer perks, she soon succeeds in poaching nearly all of their business and starts to accumulate a tidy sum in profits. Her ambition however stretches beyond a grocery store and its relatively modest financial potential. She is intrigued to meet a handsome stranger Charles Mortimer Rennie, who tells her that there are large deposits of oil on the edge of town and he is looking for a financial backer to help him exploit them.Jeckie agrees to throw her lot in with Charles to get their hands on the land under which the oil can be drilled. It belongs to an elderly man Scholes Moore Marriott, who is of the opinion that it is a stony, barren and useless plot, and is happy to sell for what seems on the surface a generous price. The oil operation quickly proves to have huge financial potential, and soon becomes a sizeable industry raking in vast profits. Now a wealthy woman, Jeckie buys the grandest house in the area and lives a life of luxury. She has fallen in love with Charles, but when she learns that he has misled her and is in fact married, she orders him to leave and says he will get no more share of the profits. ........
Source: Wikipedia