Sarah Manguso is one of the most innovative nonfiction writers working right now. I fell in love first with her 2012 book The Guardians: An Elegy for a Friend and then with Ongoingness: The End of a Diary from 2015. These books are short and the sentences are spare, but Manguso’s writing is suggestive and deep. It doesn’t fit clearly into any genre, mixing memoir and essay with a dash of poetry. I have yet to read her forthcoming book 300 Arguments, but I’m prepared to love it. It’s a collection of aphorisms about desire, ambition, and relationships, and it offers the enticing pleasures of a rich, contemplative reading experience.