IGN’s Guide to sneaking your way through Dishonored: Death of the Outsider non lethally in Low Chaos. Continuing in Mission 4, Billie makes her way up through the floors of the Royal Conservatory and dealing with the Overseers and Sisters within.
For more guide help, check out the Dishonored 2 Wiki at http://www.ign.com/wikis/dishonored-death-of-the-outsider