Wall Street Journal investigative reporter John Carreyrou spent years investigating the extraordinary fraud at Theranos — the blood-testing company founded by Elizabeth Holmes that at its peak was valued at $9 billion on the basis of technology that simply did not work — and this Pulitzer Prize-winning account is the definitive record of one of the most consequential corporate frauds in American history. Carreyrou traces Theranos from Holmes's founding vision of a device that could run hundreds of medical tests from a single finger-prick of blood — a genuinely revolutionary idea that attracted a board of luminaries including Henry Kissinger and George Shultz and investors who poured hundreds of millions of dollars into the company — through the years of deception during which Holmes and her partner Sunny Balwani concealed from patients, investors, and partners that the technology was fundamentally broken. The book is remarkable for its documentation of the human cost: patients who received dangerously inaccurate test results that affected their medical treatment, employees who raised concerns and were fired or sued into silence, and the sophisticated journalists, scientists, and investors whose due diligence was defeated by Holmes's charisma, secrecy, and willingness to lie. The story raises profound questions about Silicon Valley's culture of fake-it-till-you-make-it optimism, the failure of boards and venture investors to conduct basic technical verification, and the dangers of elevating narrative charisma over demonstrated results.