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Play the quest until Coen is invited into the Manumit hideout.
For The Turncoat: interact with the hideout door at night once Brencis has asked you to mark it.
Only what a source states. A quest with nothing listed is a quest whose rewards are unpublished, not one that gives nothing.
The most load-bearing side quest in the game and the least described: it is the third step of Crake's ten-quest chain and the prerequisite for the hideout that The Turncoat is built on, and no source gives its objectives, its rewards or its time cost.