Offered and Lost

Offered and Lost is a main quest in Dragon Age II.

Acquisition
This quest is acquired by turning in the quest Blackpowder Courtesy at Viscount Dumar.

Walkthrough

 * Talk to Seneschal Bran in the Viscount's Keep. He will direct you to The Hanged Man (night) to find the guards who allowed the Qunari to go missing.
 * Visit The Hanged Man and speak to Orwald the Braggart. The conversation will lead to a fight, and after defeating him, he will tell you that he was under orders by a templar bearing the seal of the grand cleric. Note: if Isabella and/or Varric are not in your Party at the time, they will join the fight anyway, since they hang out at The Hanged Man.
 * Visit the Chantry. There you will meet Sister Petrice. She will setup a meeting point with Hawke to hand over the offending templar, Ser Varnell.
 * Visit the new location on the map within Kirkwall during daytime, Ser Varnell's Refuge. Hawke will fight Varnell and many fanatics, or you may choose to support Varnell, in which case the Qunari will break free of their chains and you will have to fight them instead.

Result
The Viscount arrives and finds the bodies of the missing Qunari delegates, tortured and killed by Varnell and his fanatics.

Dialogue
(After meeting Mother Petrice)
 * Aveline: Need to say I'm skeptical.
 * Hawke: It's her game, for the moment.