Kakfa has given Adam Gauntlett’s mini-adventure for Trail of Cthulhu, RMS Titanic: The Millionaire’s Special, 5/5 stars in his RPGNet review. All proceeds from the sale of this adventure go to the Heroes in the Dark charity. You can read the full review here.
Where the Enchanted World of First Class is contrasted with grim and grimy reality of steerage, and where a Mythos monster is unleashed to an unsuspecting ship. I can, at least, reveal one spoiler that the Mythos entity is not responsible for the sinking.
All in all this is an excellent adventure and worth every penny.