Meeting the Mystery to Be

They thought it would be just another case. Another one of those common folk asking a Holmes detective for help to find a friend? A lover? Didn't matter. It paid the bills. But this one... this one was different. It wasn't humane. It wasn't... Human. Angels, Hunters, Time Lords, Companions, and the world's only Consulting Detective all brought together in a twist of fate. But was it, really fate? Or was it another species in the race to win it?