Kahn kept the letter in his pockets and left the house.
His destination was a secret and desolate location outside of the city as mentioned in the letter.
Just an hour ago, he read the letter and had many thoughts about the message written inside the letter. The main context was something he hadn't expected to receive from the sender.
The most important part of it was these simple words.
COME QUICKLY. WE DON'T HAVE MUCH TIME LEFT.
Kahn understood that these were not the type of words the people who sent him the letter would casually use if it wasn't of utmost importance.