Hello! I've been searching but can't seem to find a particular fic, and was wondering if maybe you could help...? It's set in the future, and everyone uses time as a currency, with a device on their wrist that tells them how much they have. Eventually John, Sherlock, Lestrade and Sally go to rob Mycroft at his bank, which is in the highest zone. That isn't very descriptive but it's the best I can remember (ps you're amazing and I've read so many wonderful stories you've shared)
Description: In 2169, time is money—literally. Humans are genetically engineered to stop aging at 25, when the numbers on their arm start counting down from one year. When that time is up, they die. The only way to get more time is to earn it, borrow it, or steal it.
John Watson lives day-to-day in the crowded slums of Zone 13. He never imagined living any differently—until he meets the practically-immortal Sherlock, and helps him on a case to track a local time-thief…