Molly and Sherlock go undercover as a married couple, to bring down Set Carter, a leading drugs lord with a secret society that could be the key to his downfall. The pair, along with John and Mary, are tested physically, morally and emotionally. Will they all realise what it means to be the people they are with the careers they have? Will romance blossom?

Molly asks Sherlock for an unexpected favour & much to his surprise, he agrees. Plotting ensues with help from John. One-shot. Betaed by ThinkswithPen.