The Sorrow of Mulberry Manor

FitzSimmons Christmas fic: Days before Christmas, a snowstorm strands the team in Vermont. They manage to get to a nearby S.H.I.E.L.D. safe-house, but it's hiding a terrible secret. Is Jemma going mad? Or is there really something - or someone - else there with them? And why is she the only one affected by it? Ghosts, an unsolved tragedy, and, just maybe, a long overdue romance.