The Landlady is about an elderly woman who kills her house guest by poisoning them with arsenic and then stuffs their bodies. Lamb to the Slaughter is about a housewife Mary Maloney who kills her husband Patrick Maloney, with a leg of lamb, after he ends their relationship.
The Landlady is an elderly woman 'about forty-five or fifty years old...' She seems 'terribly nice' and 'looked exactly like the mother of one's best school-friend welcoming one into the house' with a round