A virus is unleashed and a chilling massacre runs through the streets of Montevideo. The sick are found in hunters and only calm their fever by unscrupulously killing those who are not yet infected. Unaware of this, Iris and her daughter spend the day at the sports club where Iris works as a security guard. When night comes, a merciless fight is about to begin. Their only hope of salvation comes when they discover that after each attack the infected seem to have 32 seconds of peace before reloading.