The Thieves Guild of Phlan, calling itself the Welcomers, operate with impunity in the New Settlement, and have agreements with the surrounding inhabitants of the Slums to pass unrestricted through the Old City.

Fizzl's task will be to uncover a means of entry into the guild, whose members cut off their left ear to identify themselves among their fellows.  It won't be easy to get in.  Once inside, it may be impossible to leave.