The first mistake he made was opening the door when Jesse Klaver showed up on his doorstep, bag in hand.
The second mistake he made was letting him in - in more ways than one.
Zayn receives a interesting fan mail. What he finds inside is unbelievable. Did the fan send it by mistake? Or did she intended to? And what will Zayn do with it? Will he find her to give it back to her personally? Or read it.