A wealthy woman was found murdered on Sunday morning.
Her husband immediately called the police.
The police questioned the husband and the staff.
Here are their alibis:
The husband said he was sleeping.
The cook was cooking breakfast.
The gardener was picking vegetables.
The maid was getting the mail at the roadside mailbox.
The butler was cleaning the closet.
The police instantly arrested the murderer.
Question :
Who is the guilty person and how did the police know?
the maid was the murderer as the mail doesnt get delivered on sundays