Barcelona, August 17, 2017. On a sweltering summer afternoon, with the city’s streets packed with people, a terrorist attack changes everything forever. As chaos engulfs the city, Operation Cronos is launched: a police operation aimed at capturing those responsible for the attack—not only for what they have done, but for what they may still be planning. In the days that follow, the security forces race against time while the people of Barcelona stand united behind three words: No tinc por (“I am not afraid”).