On April 3, 2017, there was a terrorist attack in the metro in St. Petersburg. The underground was closed. The historic city with its narrow streets is stuck in maximum traffic jams. Buses are packed to capacity, people do not fit on the sidewalks. Thousands of pedestrians found themselves in a many-hour urban trap without the opportunity to get home. But random car owners began to coordinate via the Internet and deliver desperate pedestrians home for free. And many institutions of St. Petersburg opened their doors to everyone who needed help. The heroes of the film are ordinary citizens who are ready to help their neighbor.