In these new essays, Williams explores the concept of erosion: of the land, of the self, of belief, of fear. She wrangles with the paradox of desert lands and the truth of erosion: What is weathered, worn, and whittled away through wind, water, and time is as powerful as what remains.

"What if you woke up one morning and found you'd acquired another self--a double who was almost you and yet not you at all? What if that double shared many of your preoccupations but, in a twisted, upside-down way, furthered the very causes you'd devoted your life to fighting against? Not long ago, the celebrated activist and public intellectual Naomi Klein had just such an experience--she was confronted with a doppelganger whose views she found abhorrent...