Margot, a brilliant yet insecure medical student, struggles to keep up with the frantic pace of her emergency room rotation. But exhaustion is the least of her worries: a wave of young patients arrives with inexplicable symptoms that defy all clinical logic. As the line between her diagnoses and her own reality begins to blur, Margot discovers—to her horror—that her own body is starting to replicate the very same mysterious pathology she is trying to cure.