If i remember you can't leave the city because your accused of the Ember Crime and you have to be Squired by Sir Grayson and after talking to Nasher about getting Squired you have to meet at Merchant District in Greycloak's headquarters and talk to Grayson and you auto travel to a Vigil location than continue from there.
So after talking to Nasher in Blacklake District he tells you to report to Greycloak Headquarters than you have to travel to the next district so only 3 locations should show up at that point Docks, Merchant & Blacklake Districts.
try talking to Nasher again or if you have a previous save from before the final battle in Chapter 1 you could go back there or even the start of Chapter 2.
Post edited January 17, 2018 by Cerabelus