I'll be keeping this review quite short as I still have to process the absolute masterpiece I have just played. One of the few things I can say is that during my walk to the mission's exit after having completed all my objectives and spending well over 4 hours (without any major interruption) traversing the city I was still hoping that I had not yet reached the end.

Hopefully I'll remember to update this review soon, but in the meanwhile I wish to say: if you like city missions with creative verticality, please play Behind Closed Doors! While I realize that this mission isn't underrated due to its high rating count and average, I hadn't heard of it before, so I'm hoping there are still people out there who have yet to play this and adore it as much as I did.