- Talk to Elena in a house just west of the East Ardougne north bank, across the river.
- Talk to Jerico, who is in the building south of the Ardougne north bank.
- Search the cupboard near Jerico for some bird feed.
- Go behind Jerico's house and pick up a pigeon cage.
- Go back across the river, west of the castle to the West Ardougne gate.
- Use bird feed on the watchtower fence (the spears, highlighted in red on your minimap) where several Mourners are perched above, and open the pigeon cage.
- Talk to Omart, south of the gate to West Ardougne, along the wall at the corner.
- Talk to Omart again.
- Go to Martha Rehnison's house, highlighted in the picture, north-west of where you breached the wall.
- Take the rotten apple on the east side of the house.
- Squeeze through a gap directly east of the rotten apple, along the west side of the metal fence.
- Use the rotten apple on the cauldron in front of you.
- Go back through the fence and attempt to go into the house, a mourner will stop you.
- Go to Nurse Sarah's house in the corner, south-west of the church.
- Search the box on the north side of the house to obtain a doctors' gown.
- Equip the gown.
- Go to the north-east corner of the city, and enter the Mourner Headquarters.
- Open the door to the west and go upstairs
- Open the door to the east and kill a Mourner to obtain a key.
- Use the key on the gate in front of you to get into the caged room.
- Search the north-eastern Crates to find the distillator.
- Return to the West Ardougne city centre, and exit through the manhole.
- Talk to Elena.
- Without teleporting, go to bank and deposit your plague sample. Teleporting with the Plague Sample in your inventory will destroy it, forcing you to retrieve another sample from Elena.
- Retrieve the plague sample from the closest bank to Rimmington and walk there. (Skills Necklace teleport to the Crafting Guild is the quickest.)
- Enter the western most house in Rimmington and talk to the Chemist.
- Talk to Chancy.
- Talk to Da Vinci.
- Talk to Hops.
- Deposit your plague sample back in the bank and go to Varrock.
Delivering the SamplesEdit
: Touch paper
, Plague Sample, Priest gown top, Priest gown bottoms
- Obtain the plague sample from the bank.
- Go through the gate south-east corner of Varrock.
- Talk to the 3 chemist's assistants at the Dancing Donkey Inn to get the vials back.
- Equip the priest gown top and bottoms now.
- Go to the building south-east of the pub and go inside.
- Talk to Guidor, tell him you are sent by Elena, and give him the samples.
- Talk to Elena.
- Go to Ardougne Castle, south of Elena's house, and climb either the stairs to the north or south.
- Talk to King Lathas, who is in the middle chamber of the 1st floor[UK] of the Castle.
- Quest complete!