Connie Prince, who allegedly died from tetanus. Sherlock disproves the cause of death, and Watson interviews Prince's brother Kenny; Sherlock pins the crime on the housekeeper Raoul de Santos—Kenny's lover—who murdered Connie by increasing her botox injection. Despite Sherlock solving the puzzle, the hostage is killed for describing the kidnapper. The fourth message is a photograph of the River Thames, and no hostage calls; Sherlock and the police discover security guard Alex Woodbridge's body on the riverbank. Sherlock claims that Woodbridge was strangled by an assassin called the "Golem" using his bare hands. After tracing Woodbridge's interest in astronomy, Sherlock deduces that the guard had uncovered a forged Johannes Vermeer painting about to be exhibited. While Sherlock examines the painting, a child hostage calls: Sherlock has ten seconds to prove the forgery. He spots a supernova in the painting that post-dates Vermeer, thus stopping the bomb. The museum curator confesses the forgery and outs her accomplice: a man named "Moriarty". Watson investigates West's death and Sherlock discovers it as the fifth mystery. They track down Joe Harrison, West's potential brother-in-law, who admits to stealing the flash drive and accidentally killing West in an argument; unable to sell it, Harrison keeps the drive. Instead of luring Moriarty with the device, Watson arrives as the fifth hostage, wearing an explosive vest. Moriarty appears and leaves after a brief interaction with Sherlock and Watson. However, as Sherlock takes off Watson's vest, Moriarty returns (having changed his mind) with multiple snipers aiming at Sherlock and Watson. Sherlock then aims his handgun at the explosive vest, intending mutual assured destruction. Sources and allusions As with all episodes of Sherlock, the plot combines those of a number of works by Sir Arthur Conan Doyle. Sherlock's surprising ignorance, discussed on John's blog, about several commonplace subjects including astronomy, comes from A Study in Scarlet, as does Holmes' annoyance about ordinary people filling their minds with useless subjects. Andrew West, the name of the MI6 clerk, comes from "The Adventure of the Bruce-Partington Plans". The third episode of the 2010 BBC Sherlock series titled "The Great Game" made reference to The Five Orange Pips being sent by an assassin organization as a warning. In the episode, these pips were five electronic beeps, like the pips (the time signal) broadcast on the hour by the BBC's analogue radio stations. Production According to the DVD commentary, "The Great Game" was