Now you are at the home, especially the bathroom. There are not any guards in here, so ensure you check in the hallway there are no guards there. After the hallway is clear of guards, exit the door and rush in the closest area, a bedroom. There's one guard here, facing the window. Switch run OFF, and walk into the guard. Ensure that you don't walk within him, or he'll kick you out of the whole location.
Walk directly behind himand attack or pickpocket him. He has 20hp, so attempt to make a fast kill, or if you have a fantastic thieving (60+) Pickpocket him. This item is essential. Put it on, and take all of your other armor except your weapon off. Exit the area, with run away, in the hallway. Walk beyond any guards to the previous room, at the end of the hallway. When no guards are facing you, put on your armor and open the door. The hostage-taker will attack you with range and melee.
He's level 108 with 450HP, which makes it a small struggle to kill. During the struggle, guards may enter the space and attack you. There's a high likelihood he will summon a High Guard (level-75) to mage you with a very strong Wind Wave. When he's dead, then speak into the Hostage, and scale out the window and run to the exit, with numerous level 35's which range you. There can, occasionally, be around 20 guards attacking you, so be cautious and quick. When you depart, you'll be provided a reward: Money, a Rune item, Runes, or even a Kandarin Shield, equal to Adamant, and will let you get into a place where 3 Hostage Guards are resting, to kill.