The Master of Disguise is a Police Case & Main Case in Sherlock Holmes Chapter One. This walkthrough will guide you through all objectives of the The Master of Disguise quest.
Starting Borough: Scaladio
Starting Location: Cordona Police Station
Quest Giver: Mr. Stark, the Clerk at the Police Station
Requirement: Finished the graveyard section of Main Case “A Mother’s Love”, after having visited your mother’s grave.
Reward: 
Mamma Mia! (missable), 20 Money
Case Info: The police need to get a sketch of the thief who robbed Mrs. Nini’s atelier. The sketch artist was unable to capture the likeness of the culprit, but my disguise skills may prove more effective. The atelier is located at the intersection of Knights Rd and Trinity Way in Scaladio.
Starting Location: The Master of Disguise
The Master of Disguise Police Case starts in Borough: Scaladio, Place: Cordona Police Station. It’s a sub-quest during “A Mother’s Love”. During this main case you must enter the Police Station to search the archives. However, to gain access to the archives you must first help solve a case for the police. This case starts automatically upon entering the police station and talking to the clerk, Mr. Stark.
Mrs. Nini’s Atelier Location
Mrs. Nini’s Atelier is located at the intersection of Knights Rd and Trinity Way in Scaladio. You can view street names on the world map. It’s just a few meters west of the police station, see the map location below.
Sketching a Thief
After entering, talk to Mrs. Nini and go through the dialogues. It doesn’t matter in what order you pick the dialogues. Instead of making a sketch from her memory, Sherlock offers to try on some clothes and makeup to replicate what the thief looked like. Enter the back room.
Grab the clothes scattered around the room. You can press 
/ 
to scan for them. There are 2 pieces on the left and 2 pieces on the right in the shelves.
Missable Trophy: You can earn Mamma Mia! trophy / achievement here by disguising as the old man on the portrait first. Make sure you do this before disguising as the real thief.
These are the exact clothing items you must equip for the trophy (Wardrobe menu):
- Clothes: White Suit (alternatively, Ugly Beige Suit works too)
- Hat: Top Hat
- Glasses: No Accessories
- Mustache: Long Sideburns
- Old Man Make-Up
Disguising as Thief
After you got the optional trophy, disguise as the real thief, below are the exact clothing items to equip:
- Clothes: Ugly Beige Suit
- Hat: Bowler Hat
- Glasses: Square Glasses
- Mustache: Pencil Mustache
- Makeup: Fake Bruises
Talk to Mrs. Nini again to jog her memory, she’ll confirm you look like the thief. That’s all you can do here, now head back to the police station.
Return to Police Station
Head back to the police station and talk to the clerk again who gave you the quest. This completes it and opens up the archives.
This finishes the Master of Disguise case in Sherlock Holmes Chapter One.
Continue with Main Case: A Mother’s Love – Objective: Search the Police Archive or feel free to tackle any of the Side Cases at this point.
For all other Cases, view the full Sherlock Holmes Chapter One Walkthrough.
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