On the Loose - p. 2 Dragon Age II Guide
Last update: 11 May 2016
Step 4: Find Evelina
Evelina is second missing person and in order to find her go to the [Darktown] location. Explore the central part of this area and find Walter #1 (M23, 19). Then talk to him. You can of course ask him several questions about living in the Darktown or about Evelina #2. Regardless of the selected dialog options, you'll learn at the end of conversation that Evelina has a hideout under the Darktown.
You can now explore northwestern part of Darktown by finding a passage (M23, 15) leading to the [Darktown - Sewer Passage] location #1 (M89, 1). Now head west and prepare to deal with a group of monsters. First get rid of all shades #2 and then kill a rage demon.
Now head north, but watch out for the trigger trap - you'll come up with it before reaching a larger chamber #1. But this is not the end of "attractions" as the emergence of a new group of monsters activates a fire trap #2 and the only thing you can do is to wait until enemies leave push tiles.
Also in this chamber you have to eliminate shades #1 and rage demons #2, but this time there are more of them. Do not let the monsters to surround your party and use any medical assistance you have if needed.
After winning the battle use the stairs, but be careful, because there is one more trap #1 at the top of it. Now you can head east. After reaching the place you'll see a cut-scene in which you meet Evelina #2 (M89, 2).
Regardless of selected dialog option #1 Evelina will turn you into a monster and you have to fight her. Shortly after the battle begins, attack Evelina #2 first. Try to eliminate her as soon as possible watching out for spells cast by her (an exploding energy burst for example).
After killing Evelina you can deal with shades #1. It shouldn't be a big problem for you, especially since many of them have very low HP now. After the battle you have to talk to Walter #2 again. Now you can act in two ways: you can give boys 5 sovereigns (upper right dialog option) or encourage them to take the initiative (bottom right dialog option).
Step 5: Find Huon
Elf Huon is third missing character and in order to find him you have to go to the [Lowtown - Elven alienage] location during the day. Upon arrival find Huon's wife, Nyssa #1 (M12, 24) and talk to her. She'll tell you that her husband has changed and she is afraid of him. Nyssa will tell you also that Huon is planning to meet her in the evening #2.
Leave the elven alienage for now (you can enter Merrill's house for example) and return there during the night #1 (M13, 24). This time you'll meet Huon, who murders his wife right in front of you #2. As you can guess all dialog options don't play any role in this moment while you have to confront elf and defeat him in a direct combat
Huon will summon quite a group of monster to help him, but you should attack him in the first place #1. Remember that he is a Blood Mage so be ready to heal your party members if he drains their life energy. After dealing with Huon kill all shades #2 in the area - they shouldn't be a big challenge. After the battle, examine the Houn's corpse - you'll find a recipe and Boots of the Champion, which are part of a set.
Step 6: Return to Knight-Commander Meredith
You can return to Meredith only after finding all three apostates. Go back to the [Gallows Courtyard - Templar Hall] location and click on the door of the Knight-Commander Meredith headquarters #1 (M87, 2). If you released Emil, you can act in two ways now #2: lie that he has died (upper right dialog option) or tell the truth (bottom right dialog option). If you have Anders in your party, he can join the conversation and tell Meredith that he is against her actions. What's interesting, regardless of whether you agree with Anders opinion or not, your relations won't change. The quest will be completed after the conversation is over. Now you have to return to the Hawke Estate, because in order to activate the next quest, you have to read a note at the writing desk (M14, 12).
It is worth noting that if you released Emil, you'll find at the writing desk a note from Count who rewards you with 5 sovereigns and if you have gave Walter money, he sends you his thanks. In addition it is also good to read a message from Elsa in order to get next 5 sovereigns.
Unlocked companion quest: A small problem