Describe how the setting in "Lamb to the Slaughter" helped Mary Maloney.

Mary commits her crime right in her own house. The murder weapon is easily available because she uses a frozen leg of lamb she takes right out of her big freezer in the cellar. If she had killed her husband with a more conventional weapon she would have had more trouble disposing of it. She has a kitchen where it is easy to pop the leg of lamb in the oven, and the kitchen is spacious enough for four policemen to sit down and eat it. The grocery store is in close walking distance. She goes there to establish an alibi, because she has to be out of the house when the murder by an unknown assailant supposedly occurs. Sam the grocer knows her well. He can testify if necessary that she spent some time there that evening. In any other setting, there would be some danger of Patrick Maloney's body being discovered. But no one can discover the body in the privacy of the Maloneys' home, and there cannot be any witnesses to what occurred. The police never think of a frozen leg of lamb as a murder weapon. They are looking for something like a heavy metal tool of some sort. The setting is perfect for giving the impression that some enemy of Patrick's had been watching the little house and had slipped in and committed a revenge-murder when Mary went to the grocery store.