For video game fans, the name Blizzard Entertainment was once synonymous with perfection. The renowned company behind classics like Diablo and World of Warcraft was known to celebrate the joy of gaming over all else. What was once two UCLA students' simple mission launched an empire with thousands of employees, millions of fans, and billions of dollars. But when Blizzard cancelled a buzzy project in 2013, it gave Bobby Kotick, the infamous CEO of corporate parent Activision, the excuse he needed to start cracking down on Blizzard's proud autonomy. Activision began invading Blizzard from the inside. Glitchy products, PR disasters, mass layoffs, and a staggering lawsuit marred the company's reputation and led to its ultimate reckoning. Based on firsthand interviews with more than 300 current and former employees, this chronicles the creativity, frustration, beauty, and betrayal across the epic 33-year saga of Blizzard Entertainment.