As the sun sets, they see a faint shadow of darkness that seems to have a life of its own. The stars come out, but the dark shadow remains. Meg feels how terrible the shadow is, and is afraid. Calvin asks Mrs. Whatsit to make the dark Thing go away, because he knows it is evil.
They travel down again, in silence. When they return to the field, Meg asks Mrs. Which whether the dark Thing is what her father is