Work Text:
Time was starting to run out for the Baker Street boys but none of them were aware of it yet. They had no idea their every move was being carefully watched. The only hint anything might be wrong was a threatening phone call last christmas that still had not actually come to anything. Gradually, since then, Sherlock had found himself being lulled into a sense of security because surely, by now, the mysterious person would have stepped forward and revealed themselves by now. He had no idea that Shape-shifters were going missing all over London.
In fact nobody had noticed. The mysterious threat giver had been clever, picking off Shifters who either had no family or who nobody would miss. It was going to be a while before alarm bells finally began to ring and by then it was already be too late. The new threat to the Shifter community would be almost impossible to stop...
But the Baker Street boys would not be aware of the threat for another few months. For now they remained oblivious, enjoying themselves and their hard won peace they are almost died to achieve. They had no idea of the shock that was to come or how their skills and their relationships would be tested to their absolute limits...