Two short missions, a mainline story quest and a side mission where I kill the vampire underboss. The former I investigate Dr. Hunt's disappearance. I will leave this unanswered so as not to spoil it.
Alright! It was tough as I had a hunter alien on my heels the whole time, but I was able to reach Nicole, who was attached to the Marker. I defeated her (eventually) and made my escape with Ellie. What a cool game. Final boss and game ending! Great stream!