But monsters, I now know, come in all shapes and sizes, and only their appetite for human flesh defines them.

I would kill for a cheeseburger. Honestly. If I stumbled across someone eating a cheeseburger, I would kill them for it.

And no answer when we sent our message. Something like, "Hello, welcome to Earth. Hope you enjoy your stay. Please don't kill us.

It's hard to plan for what comes next when what comes next is not something you planned for.

To hold on, you have to find something you’re willing to die for.

Do you know how to tell who the enemy is, Cassie?

I had it all wrong," he says. "Before I found you, I thought the only way to hold on was to find something to live for. It isn't. To hold on, you have to find something you're willing to die for.