Dragon Age 2 - Ladies' Lights Out is a short side quest in Act 2. For this walkthrough, players will first need to find a note on the Invisible Sisters bandits in Hightown any time in Act 2, after being attacked by them.

1. In order to receive this quest, players will need to travel enough times in Hightown at night to be ambushed by the Invisible Sisters, who will drop a note that you will automatically pick up and read when looting. 
   
2. Go to the quest location following the arrow to enter the Sisters hideout.
3. Slay the Sisters and their leader inside the hideout to finish the quest.