Echostreet Alley was an area in London, United Kingdom.
Echostreet Alley got its name from the screeching sounds of trains pulling into the nearby Waterloo station. The Lambeth Blighters, working under Cletus Strain, coined the name when they developed Echostreet Alley into one of their two strongholds in the borough.
When, in 1868, the Assassins started their efforts to liberate London from the Templars, Henry Green provided Jacob and Evie Frye with several leads. Among these leads was Echostreet Alley, which the twin Assassins managed to liberate, allowing the Rooks to use it as a stronghold for their gang instead.