This guide is suitable for current RuneScape and Old School.
Carnillean Mansion is located just South of the Ardougne Castle. Head there and talk to Ceril. After talking to him go out and head South across the bridge. Walk around behind the Clock Tower and go into the Cave. Inside you will find a man named Clivet. Talk to him and decide who to help. If you want an interesting plot and storyline and a harder quest, join Clivet. If you want a short, simple and easy quest, join Ceril.
If you wish to join Clivet, talk to him and agree to help him. He will give you some poison and tell you to kill someone in the Carnillean family. Go back to the Carnillean Mansion and go downstairs to the basement. Use the poison on the range. Go back upstairs and talk to Philipe. You will find out that you have killed their dog.
Go back to Clivet and tell him of the death. He will give you Hazeel's Mark. Wear it and leave the cave. Go and turn all of the valves shown in the picture below right (Marked in yellow), but turn the one closest to the cave left (Marked in blue).
Go back into the cave and get on the raft near Clivet. When the raft stops again get off it and follow the path to Alomone. He will ask you to go and find a magical scroll hidden somewhere in the Carnillean Mansion. Get back on the raft and leave the cave.
Go to the Carnillean Mansion once more with Hazeel's Mark still on. Talk to the Butler then climb down the ladder into the basement and look inside the crates for a Chest Key. Go back up the ladder and continue up the stairs to the second floor. Knock on the wall and you'll find a Secret Passage. Go inside the wall and go up the ladder. Use the Chest Key on the Chest and look inside it. You will find the Magical Scroll Alomone mentioned earlier.
Go back to the caves. (Note: You do not have to turn any more sewer valves so don't). Get on the raft and go back to Alomone. Talk to him and he will start a ritual and summon Hazeel back from the dead. Hazeel will talk to you then reward you for resurrecting him.
If you have done the Quest up to here, you do not need to do the rest.
If you wish to join Ceril, talk to Clivet but don't agree to help him. He will get on board a raft and head off downstream. (Note: If he doesn't, try talking to him again and let him talk to you a bit more first). Go back to Ceril and talk to him about Clivet. Go and turn all of the valves shown in the picture below right (Marked in yellow), but turn the one closest to the cave left (Marked in blue).
Go back into the cave and get on the raft near Clivet. When the raft stops again get off it and follow the path to Alomone. Talk to him and you will find out that the Carnillean's Butler is his spy. Alomone will then attack you. Kill him and he will drop the Carnillean's Armour.
Go back to the Carnillean Mansion and give Ceril the Armour you got from Alomone. Then tell him that his Butler is a spy. Ceril won't believe you so go to the second floor of the Mansion and look inside the Butler's wardrobe and you will find poison. Go back to Ceril and he will give you your reward.
Congratulations! Quest Complete!
Guide Made by: PartyHatLove
Corrections submitted by: Doctor Shemp, Deathslayer, DaDa, Simon, PartyHatLove, Panda, Power of Five