What happens when a epidemic breaks out, but you're kept in the dark? Anything can happen. Slowly the residents realize that they will all die unless they come together. 人性与现实。 一早醒來發現家中停水停電，門窗全都被不知名的膠類堵住而出不了門的馬克，看著樓下有多名身穿橘色防護衣的人員來回穿梭。突然間，牆壁被四名住在附近的鄰居打穿，伴隨大樓不定時地傳來的廣播，沒人知道外頭發生什麼事。當他們伺機抓到身穿防護衣的黑蘇爾，得知外頭盛傳一款傳染力極速的新型病毒，透過呼吸相同空氣就會被感染。面臨從外頭闖入的陌生人以及意見分歧的盟友，馬克終將有所犧牲。在這場病毒災難中，誰能生存到最後？
