The door into the hall was a telescoping metallic aperture, which opened when she presented it with the right scent, allowing Sarah to pass into the hall. She wandered for a short distance, appreciating the guards at either end of the hall. Changelings could copy many things, but the one thing she didn’t think they could imitate was each other. The colorful guards kept those forms as a way of proving their identities. And so far as Sarah knew, that meant she was safe.