Sherlock: The Great Game #4 — Mark Gatiss

Sherlock's opponent upped the stakes by causing an explosion and killing twelve people, but the detective quickly moved on to solving the next case. A body has turned up on the banks of the Thames, and Sherlock is convinced it has something to do with a recently-discovered Vermeer painting. Meanwhile, without the help of his friend and at Mycroft's request, John continues to investigate the mysterious death of a MI6 agent.