A virus breaks out and a chilling massacre rages through the streets of Montevideo. The sick become hunters, and only calm their fever by unscrupulously killing all those not yet infected. Unaware of this, Iris and her daughter spend the day in the sports club where Iris works as a security guard. When the night comes a fight without mercy is about to begin. The ironly hope of salvation arrives when they discover that after each attack the infected seem to have 32 seconds of peace before charging again.