Extracting the Defector

Steps

 * 1) Enter South Freeport via Thieves' Way, you will come into the city next to The Freeport Block and Tackle. Follow the dock around the back side of the building near the water to avoid the guards around front. When you come to the end of that dock take a right and go to the end of the next dock where the Seafury Buccaneer's ship is located. If you are facing the water the entrance to the secret hideout will be on your left.
 * 2) Once inside stay in stealth if you have that ability or a totem. Only two of the mobs in the instanced will be able to see you. There will be a Seafury Bartender directly in front of you who will see you if you are in stealth, body pull him back into the doorway and kill him. Enter the first room, to your left will be a Seafury Mender, body pull him into the doorway and kill him as well. Once you have removed those two mobs there will be a Seafury Patroller that roams from the room on the left to the stairs on the right, he will also see you while in stealth. Body pull him back into the doorway and kill him. Once he is dead there will be no more mobs that will see you while in stealth and you can move through the zone freely. If you are below level 30 and do not have a spell that will stealth you and can not use a totem then you will have to clear the whole zone to proceed.
 * 3) While in stealth go to the stairway on your right. In the corner there will be a shovel, pick the shovel up and proceed upstairs. You will enter an open room that looks like an atrium, go to the back left corner and look down. There will be a pile of dirt, click on the pile and use the shovel. At this point you should receive "A Dirty Key". Take the key back down stairs and into the room on the left. In the back right corner there is a cabinet, use your key and receive "The Captain's Signet Ring". Your quest should update and you can now leave the zone and return to Gil McMartin in The Common Lands for your reward.
 * 4) *There is another way to get the ring in about two minutes. If you are either impatient or have problems with getting social aggro when killing the patrolling guards, Try this method. Enter Stealth (Or use a totem), ignore the bartender (He/She will not aggro unless you go within attacking range either way), and wait until you can target the patrolling guard that can see you. Target said guard, and wait for him/her to walk into the room where the key is. Grab the showel, run up the stairs, and dig up the key. Quickly get back inside, jump over the railing, and stand amongst the tables in the main room. You should make it down there just in time to watch the guard come out of the 'ring room', and walk up the stairs. Go into the lower room, Grab the ring, and run out. This can be useful for making the tedious task of repeating this quest quite a bit shorter.

Credits
Submitted By Hostility, Conjurer of the Everfrost server.