From Inside the Grey House:
He laughed. “I can’t make it that easy on you. And the longer you’re busy with them, the more time I have.” Edwin paused for a moment. “You and your lot are quite useful. There are so many that I changed, or my people changed without thought. We left them to their own devices, knowing they wouldn’t last very long, and we were right.”
The grin on his face showed how he felt: he felt he was using Vincent. Vincent didn’t care. He let a moment of silence pass then asked the one question he wanted answered above all else.
“I don’t understand something, Edwin. You enjoyed being the Acting Captain for so long, why the change?”
“The humans think Christopher is dead. We haven’t heard from him in years. Why not?”