A Mad Rogue is a Cordona Story in Sherlock Holmes Chapter One. This walkthrough will guide you through all objectives of the A Mad Rogue side quest.
Starting Borough: Old City
Starting Location: Fortress of the Holy Spirit Ruins (named map location)
Quest Giver: None, automatically starts when going to Fortress of the Holy Spirit Ruins for the first time
Requirement: None, simply find the quest start in the open world
Reward: 15 Money, Father’s Skull (Supposed Skull of Siger Holmes)
Case Info: These walls hold a lot of secrets, including one of ours. Jon gave me a hint how to recall what happened here, and I can’t ignore it.
Starting Location: A Mad Rogue
A Mad Rogue Cordona Story starts in Borough: Old City, Place: Fortress of the Holy Spirit Ruins
Walk near this location and the quest will start automatically, then track it from the casebook.
Solution
1) After getting the quest, make sure you’re tracking it from your casebook. Then you should see the white outline of a circle at the ruins, to the right of where Jon is sitting. Enter concentration mode 
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to view it, it’s a boy jumping from the ruins. This quest is simply a recreation of an old memory, all you need to do is follow the white outlines of people around the streets, all shown below.
2) To the right, in the streets, focus on the man and kids.
3) Head in the direction where the man was pointing, focus on the 2 kids running away.
4) Go in the same direction as the kids, you can find them again on the right.
5) Keep following the path forward, focusing on the kids again.
6) Just a few meters further, on the left, you find the 2 kids for the last time.
7) Where the kids are, you will find some rocks on the ground. Exit concentration mode and pick up the rock, then pick up the skull underneath.
This finishes the A Mad Rogue Cordona Story case in Sherlock Holmes Chapter One.
For all other Cases, view the full Sherlock Holmes Chapter One Walkthrough.
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