Riddle: A girl named Gretel is found dead on Sunday morning, her mom calls the police, soon the police arrive and take each person's statement. The Mother says: "I was sleeping deeply and that is when I heard Gretel screaming!" The Father says" "I was at work, I found the news of my daughter fro Gretel's mom!" The younger Brother says: "I was outside playing and the soon I heard Gretel scream!" The Maid said: "I was getting a pile of mail when heard Gretel scream!" After taking everyone's statement the police arrested the murderer? Who was the murderer and how did they know?
Answer: It was the maid. There are no mails at Sundays.