I would like to let you all know that if you choose to make your way to the orphanage, there will be someone there who will shed some information about Lark. Lark will eventually make his way to the orphanage, so feel free to confront him before he visits, while he's there, or both for all I care.
Note: Just because I'm saying this doesn't mean you have to go there. I want this to be as free and open-ended as possible. If you'd rather hunt Lark down or protect civilians, feel free!