In the hospital of a large French city, Chloé, Arben and Alyson are preparing for their internship. With no real field experience, these medical students are suddenly faced with a new situation. Indeed, the department's attending physicians have been quarantined following a probable contamination with a highly contagious exotic virus. With the help of a medical examiner, these interns have no choice but to assume their new responsibilities. As the number of patients increases, they must also fig