Ask Whoreson what happened to Ciri (and Dudu); he has no idea about the latter, but Ciri escaped. Whoreson pleads for his life. You can:
Kill him. This has an effect on Act III: Main Quest: Payback, and you can speak to Dudu about your actions then.
Let him live, and incur the wrath of the other Big Four. This has an effect on Act III: Main Quest: Payback, and you can speak to Whoreson then.
Main Quest: Get Junior now concludes.