The CIA HQ from the first game is my favourite Splinter Cell mission ever. I love the premise of it; breaking into a highly secure building, extracting some information and getting out without anyone knowing you were there. All the time you knew that if Sam was caught there would be no way for Lambert to explain the mission to the president. Most of the Splinter Cell games have had some kind of spin on it, I want Blacklist to have a go.
I think the perfect scenario would be infiltrating the MI6 HQ in London to find out what they know about the Blacklist, something Fisher suspects that the Brits are purposely hiding from him. You could start by climbing out of the Thames on a rainy day and sneaking your way in. It would be a strictly non lethal mission. What do you think?