The Clockwork Conundrum

At the dawn of the 20th Century, something sinister and otherworldly is afoot in London. When August O'Neil goes in search of his mother, he finds far more than he bargained for. Fortunately, four terrapin sisters, their ninja brother, and their wise father come to his aid, bringing him into a world unlike any he's ever known. (Rule 63 and a dozen other AUs)