People with strange symptoms began to come to hospitals of Los Angeles. It soon becomes clear that the reason for this is water poisoning. City officials immediately block access to all sources. No one informs the population at a sufficient level, the panic and riots begin, because soon it will be difficult to find water all over the metropolis, but the exact hearth of infection is still unknown. To determine its location is a matter of life and death for millions of ordinary people who find themselves in a deadly trap.