A presumed virus outbreak during a flight from south Asia to Munich. Most of all, the scientific premise is utterly wrong. Retroviruses is shown as multiplying in erythrocytes, which lack a) DNA (necessary for retrovirus replication) and b) the enzymatic apparatus for multiplying any viral nucleic acids.

It's Lukas' birthday and he runs away from home to the city - but only for three days. Having just turned 14 and being on his own for the first time, he develops his very own, intense way of experiencing everything. But his light-footed excursion quickly takes a turn when he meets Sonja. Sonja is blind. Sonja is three years older. And Sonja's story and her approach to life touch and impress Lukas so much that his little journey takes a whole new direction - and gains a destination.