In her mid-20s, at the height of tech industry idealism, Anna Wiener --- stuck, broke and looking for meaning in her work, like any good millennial --- left a job in book publishing for the promise of the new digital economy. She moved from New York to San Francisco, where she landed at a big-data startup in the heart of the Silicon Valley bubble: a world of surreal extravagance, dubious success, and fresh-faced entrepreneurs hell-bent on domination, glory and, of course, progress. Anna arrived during a massive cultural shift, as the tech industry rapidly transformed into a locus of wealth and power rivaling Wall Street. But a new Silicon Valley began to emerge: one in far over its head, one that enriched itself at the expense of the idyllic future it claimed to be building.