If you dont know what that is, it is episodic content that allows you to investigate a mysterious conduit. She flys around with Origami stuff all around her and commits these murders. All of them have some kind of connection, and the evidence you gather in game, will be visible in your profile on the web site.
I think its freaking awesome! I love investigating things like this, brings back the feeling of LA Noir.
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It's not part of getting the platinum trophy, so i didn't bother.