In Chapter One (Modern Pirates), the G-Men learn that "Brenda", notorious jewel thief, is heading for the United States, to steal the Belgravian crown jewels currently on exhibit. The gems are placed on a ship bound for Belgravia, the guard is murdered and the jewels stolen. Secret Agent X-9 trails Blackstone, one of the gang, who hides the gems in a safe deposit vault of a bank. He takes the bank receipt to an art shop, where Marker, an accomplice, conceals it between an oil painting and its frame. X-9 arrests Blackstone and pursues Marker, and leaps into the speedboat Marker is getting away in. The speedboat crashes in to a buoy...see Chapter Two at this theatre next week. Shara Graustark) and Baron Michael Karsten, embassy attaché responsible for the jewels, show up next week and the remaining chapters deal with the recovery of the jewels and the unmasking of the mysterious "Brenda". Charters 9 through 12 find Brenda masquerading as the Baron and this complicates things for X-9 and, of course, the Baron.