Travel to Yanille (fairy ring code: CIQ or use the home teleport spell if you have activated the Yanille lodestone), and talk to Bert. He can be found north of the Dragon Inn and east of the house portal. He tells you that he found a hand buried in the sand.
Ask him why he hasn't told the authorities. He tells you the captain is drunk most of the time and asks if you could help him.
Agree, and Bert gives you the sand-covered hand. He suggests that the smelly hand will get the guard captain's attention.
Go to the sandpit located northwest of his house to fill the bucket for later use.
Give him a beer, and he takes a gulp and then asks what you want.
Tell him about the hand Bert found. You have a rambling conversation with the captain and then hand him the hand. He drops it in his beer—turning it into a Beer soaked hand—gives it back, and suggests you go talk to the wizards.
Talk to him about the hand, and ask if all his wizards are accounted for. After examining the hand, he tells you that this is the hand of Clarence, one of his student wizards. He asks you to help and find out why Bert's been working long hours.
Return to Bert's home, and talk to him again. He tells you he works for Sandy Sand Co., based in Brimhaven. He gives you a copy of his schedule and tells you that it hasn't changed recently—or so he thinks.
Make your way back to Bert in Yanille, and talk to him. Tell him his hours did indeed change a week ago, but Bert has no memory of it. He wonders if the wizards at the guild might be responsible for his memory loss and mentions a scroll that appeared a week ago. You ask if you can take a look at the scroll. It appears normal, but do not throw it out. If you brought a bucket instead of a bucket of sand, now would be a good time to fill it at the sand pit.
Head back to the Wizards Guild, talk to Zavistic Rarve, and show him the scroll. Rarve tells you the scroll is used in a mind-altering spell. He gives you a magical scrying orb, and tells you to get some Truth Serum from Betty found at the magic shop in north west Port Sarim. You then will be ready to ask Sandy a few questions.
Then, stand in her open doorway and use your lens on her counter to make the truth serum.
Talk to Betty again, who says you need something personal from Sandy or else the serum won't work. You hand Betty the sand you found in Sandy's pocket, and she sprinkles it in the serum, which fizzes. She recommends you dilute the serum in something like tea or coffee or else bad things might happen, such as "bits might drop off." (Note: If you lose your truth serum, talk to Betty and she will give you another for free. However, you will need to pickpocket Sandy for his sand again to complete the potion.)
Talk to Captain Tobias or one of his young sailors on the Port Sarim docks to sail to Karamja for 30 coins, and then head west to Brimhaven. You can also charter directly to Brimhaven using the charter ship which is in the southernmost dock. This will cost 1600 coins or 800 with an activated ring of charos.
Talk to Sandy, and select an astonishing option to distract him.
Use the serum on Sandy's Coffee Mug while he turns to look out the window.
Activate your magical orb and talk to Sandy. He confesses that he changed Bert's schedule and bribed a wizard to put a spell on Bert so he would believe everything Sandy said. He then admits to killing the wizard so he wouldn't have to pay him and putting his body in a load of sand.
Return to Yanille, and talk again with Zavistic Rarve. You hand him the orb and watch as the recording is played back.
Talk to him again, and tell him you've brought five earth runes and a bucket of sand. You see a short cutscene where he casts a spell on Bert's sandbox so that it will magically refill. He asks you to check the Entrana sandpit to see if you can find more bits of Clarence.
You can get to Entrana by talking to the monks at the Port Sarim docks. There is a deposit box there, and a bank in Draynor nearby. (Remember you cannot bring any weapons or armour, including the Explorer's ring, familiars, and special ability scrolls.) You may, however, bring runes(or teleport tabs) so that you may immediately teleport to Ardougne, use the Lodestone Network, or teleport to the Watchtower (or even teleport to your house, if your house is in Yanille) after checking the sand pit.
Talk to Mazion by the sand pit (it's just west of the dock), and ask if he has any body parts. He tells you he does and hands you the wizard's head.
Return to Yanille one last time, talk to Zavistic Rarve, and give him the decapitated head. He confirms it's Clarence and says he will be buried today. He also tells you guards are on their way to arrest Sandy.
Bert will ship 84 buckets of sand to your bank if you talk to him after the quest. This can be done once per 24 hours. Clicking on the quest's name will give you the time left before you can ask him again. This number is increased to 120 after completing the elite Ardougne Tasks.
Bert says "Idle hands'r Zamorak's tools." This is most likely a reference to the saying "Idle hands are the devil's tools" said to children meaning that children are more likely to get into trouble when they feel bored and have nothing to do, or the saying "The idle mind is the devil's workshop"
When Zavistic Rarve says 'Alas, poor Clarence, I knew him well', it is a reference to the Shakespeare play Hamlet ('Alas, poor Yorick, I knew him Horatio', sometimes misquoted as 'Alas, poor Yorick, I knew him well').
The rest of the dead wizard's body will be found during and after the Back to my Roots quest.
If, during the quest, you choose the option of being teleported directly to Betty in Port Sarim, your character will use the old teleport animation, where your character will shrink while being enclosed in a magical bubble.
Much of the quest's dialogue contains puns to do with hands.
If you activate the Magical Orb and get the "Nothing Interesting Happens!" it uses an exclamation mark instead of a period.
The purpose of dyeing the lens pink is most likely referencing the idiom "See the world through rose-tinted glasses", meaning only able to see the pleasant parts. Betty infers such when making the Truth serum.