Starrick's Soothing Syrup was a drug containing distilled opium that ravaged London's citizens during the 19th century.
Formulated by the Templar Grand Master and businessman Crawford Starrick and produced by Dr. John Elliotson, the Starrick's Soothing Syrup drug was exported internationally and locally by peddlers and merchants. Though the drug had multiple side-effects which caused the locals to complain, its production did not waver.
Sometime in 1868, the Assassin Jacob Frye took it upon himself to investigate the source of the syrup, tracking down its merchants and distributors which lead him to a distillation factory. Along with the concerned scientist Charles Darwin, they discovered the drug's components and ingredients. The pair turned the syrup's pressure tanks, releasing gas in the factory. This caused the distillery to explode and set fire to the building which the pair escaped. This stopped the production of the Soothing Syrup.
Darwin later informed Jacob that the rest of the drug's batches were sent to the Lambeth Asylum. He eventually assassinated Dr. John Elliotson, ending the production permanently.