This quest begins when, during "The Firebrand" quest, you manage to obtain information from Mert or his corpse about where you can find Sara.
According to Mert, a girl named Sara is the contact for the manumits. However, she may have already been captured by soldiers at the rendezvous point in the nearby woods.

1. Go to the bridge near Stoneward Post
Mert told me how to find the rendezvous point used by the manumits. I must go to the bridge near Stoneward Post and then head southeast.

2. Reach the rendezvous point
I found the bridge that the miller pointed out. Now, I must head southeast to reach the rendezvous point.

3. Rescue Sara
I should rescue her from Brencis's goons. And if I do, she might lead me to Crake, the leader of the manumits.
Sarah was captured by two soldiers - approach them. To free her, you can tell the soldiers that she is your sister and bribe them with 100 denarii. Any other choice leads to a confrontation with the soldiers, forcing you to kill them. Reward: 150XP

4. Follow Sara
I have rescued Sara, and she has agreed to lead me to Crake.
To avoid losing precious time, try to do this during the day - that way, only one time segment will be used. Follow her until you reach a camp in a clearing with a large tree. A cutscene will trigger - slightly different depending on whether it is day or night - which will end this quest and start the next one - Where Loyalty Lies. Reward: 1,000XP.

5. Ending
I spoke with Crake, though the meeting went rather differently than I had imagined. I must earn his trust if the manumits are to aid me against Brencis.
If you take too long to save Sara.
Sara was killed by the soldiers. She was my only tie to the manumits, so any chance I had to contact them died with her.
If you give in to the hunger.
I found Sara... and then I fed on her. She was my only tie to the manumits, so any chance I had of contacting them died with her.