Find the Missing Brother Investigation: Ac Mirage

Investigate Ahmad’s Office: Head to the House of Wisdom in the western Abbasiyah region.

Speak with Fazil Fahim: Find him near a scene of burnt books to learn about the situation.

Find Ahmad’s Workshop: Speak with Kahraman next to the burnt pyre; the workshop is behind him.

Explore the Workshop: After a cutscene with Nehal, investigate the items inside. Use Eagle Vision to find clues. Move the western bookshelves to reveal a diagram.

Speak with Hamid Al-Haleem and Defeat Ambush: Hamid will enter the workshop. Follow him outside and be prepared to fight two Swordsmen and one Captain. Parry Swordsmen attacks and use backstabs or throwing knives (with Armor Piercing perk) on the Captain.

Get Excavation Site Location: Speak with Hamid again; he will reveal the location of a dig site in the Wilderness region.

Find Hamid’s Map: Access the Investigations tab, select “Excavation Site” in the Ahmad ibn Musa case, click “view details,” and hover over the “Excavation Site Map” clue to see it.

Locate the Excavation Site: Travel to the Wilderness region southwest of Baghdad. Use the synchronization viewpoint near the “H” in “Baghdad” on the map, then head south. Look for smoke and wooden cranes.

Scout the Excavation Site: Use your falcon or Eagle Vision to scout the area. Identify three chests and mercenaries on a wooden platform.

Speak with Mercenaries: Convince the mercenaries to help by giving them a Power Token.

Search the Chests: Locate and search all three chests. Sneak past guards or assassinate them. One chest, located behind a barrier, contains the Doctor’s Letter, which is the clue for the next stage.