Название книги: Animorphs - 07 - The Stranger

My name is Rachel. And you know the drill. I'm not going to tell you my last name. I'm not going to tell you where I live. I'll tell you all I can, because you need to know what's going on. You need to know what's happening. But I need to stay alive. And if the Yeerks knew who I was, I would be dead. Or worse. The Yeerks are here. That's what you need to know. People look up at the stars at night and wonder what it would be like if creatures from another planet ever landed on Earth. Well, you can stop wondering. It's happened. The Yeerks are parasites. They live in the brains of other species - humans, for example. They turn human beings into mindless slaves - human-Controllers. So when I say that the aliens are here, don't go looking around for some cute little thing like E.T. You won't see the Yeerks. They are parasitic worms, evil gray slugs that live in the heads of humans.