Awoken in the middle of the night by knocking on the door outside.
I was so startled that I shivered.
"Honey, why is the door locked? Open up quickly!"
A familiar voice sounded from outside the door.
It turned out to be my husband!
I felt relieved and got ready to open the door.
Just as my hand touched the doorknob, I suddenly realized something was wrong.
My husband had just left on a business trip today; he said he would be away for a week.
It was absolutely impossible for the person outside to be him!
Then, who exactly is the person outside the door?
