Site 63: A FitzSimmons Fanfiction

FitzSimmons have found themselves trapped in an empty room at an abandoned SHIELD research facility. How did they get there? They broke the rules. Now they'll have to put their squabblings aside and get back to the Bus before anyone notices they're gone.
But soon it becomes apparent that their real problems are only just beginning. Fitz and Simmons have unknowingly walked into a trap that will test them more than ever before as shield agents and as partners.
Either they'll be leaving together or not at all.