Torix and Constantine
The van Rijns first met Ivan Thule while trying to track the source of the opium that was being sold in the eastern market district in Eisenreich. Thule is an uncompromising drug dealer who ran an operation under Thule's tavern. The basement of his tavern was referred to as Thule's den. After several akward meetings with Thule, Torix and Constantine were able to find out that Ivan Thule was charging outrageous prices for his opium becuase his source had suddenly stopped making runs into Eisenreich. Thule offered the brother's the job of tracking down Alphonse Delacroix, Thule's source in the empire of elves. After attempting to fix Mr. Delacroix's problem, the brothers ended up back in Eisenreich as gladiators. They fought and killed Thule's team in a match, and left their dwarven masters to join Thule in his business as gladiators (so that he could keep up his capital while the drug business was doing badly). Torix and Constantine were effectively under the protection of Thule and his men once they broke away from working with boss Misha. After a few more fights, Thule trusted the brothers enough to send them on more important jobs. Through a series of events, the brothers discovered a plot to kill Ivan Thule and eliminate his competition from the Eisenreich underworld. The book in which the plan was found indicated that the "book club" was behind this plot. Though the brothers were able to warn Thule of this plot, he and his gang were unable to protect themselves from the unexpected explosion that went off inside of their headquarters. But before his headquarters were destroyed, Thule went back to Isador's place and tore down the walls in an attempt to find more information. And he found it alright. He linked Isador to Vincent Violet, who he investigated to find ties to a shady individual known only as the Man in Gray. He found more documents including strange plans with a certain Izzy Valentine and love letters to someone named Rose. Before he died he was able to relate all of this information to the brothers and Bardeaux.