In the 1990s, students at the Université Libre de Bruxelles refused to donate blood for an experiment, for fear of being contaminated by HIV or hepatitis. Paradoxically, this refusal led to a revolutionary advance in the field of medicine. Their professor suggests that they take camel's blood out of the freezer, in which they accidentally discover some strange little antibodies they've never seen before. The faculty scientists take their study a step further and realize that these ultra-resistant molecules, which look like heat-seeking missiles, have astonishing properties, including the ability to sneak into places where others don't go.