Always trust me

Sara and Ivan. An eighteen-year-old girl from an upper class family and a middle aged volunteer locked inside a shelter together during a quarantine while outside a viral outbreak turns people into savage and irrational beasts. Apparently, in the safest place on earth, they will soon have to face an even worse danger: the girl is infected and she is slowly transforming. Now what? Kill her? Save her? And how will they survive if there is no way to escape?