This quest appears in your journal when you get close to one of the locations of Ambrus's dungeons - the places where you complete the following quests: Ambrus's Dungeons: Evil and Convenience, Ambrus's Dungeons: Judge and Executioner, or Ambrus's Dungeons: Twists and Turns.

Ambrus's men have set up a number of heavily guarded outposts - I should find out what they're doing in there.

Ambrus's Dungeons

Quest stages of Ambrus's Dungeons

1. Investigate Ambrus's soldier outposts to learn more

Soldiers in large numbers never bode well... I have to take a closer look.

Kill the soldiers and loot the Directives from Ambrus from one of their bodies.

Investigate Ambrus's soldier outposts to learn more

After reading the note, three new court quests will appear in your journal:

Investigate Ambrus's soldier outposts to learn more

2. Ending

Ambrus's men are draining his prisoners to death, harvesting them for blood, filling entire barrels... This must stop.