Through the the open window and the crack of the door, the wind came in, and rustled the book pages.
the preposition is "of" as opposed to "around".
What does "crack of the door" refer to?
1) the door was open and there is a crack
2) it refers to that kind of crack when the door is closed.
3) The door is broken, and crack refers to chinks
All the pictures came from Google search.