That This

Susan Howe’s newest book of poetry is a revelation as well as a mystery. "What treasures of knowledge we cluster around." That This is a collection in three pieces. "Disappearance Approach," an essay about Howe's husband's sudden death—"land of darkness or darkness itself you shadow mouth"—begins the book with paintings by Poussin, an autopsy, Sarah Edwards and her sister-in-law Hannah, phantoms, and elusive remnants. "Frolic Architecture," the second section—inspired by visits to the vast 18th-