En haute mer, un marin est assassiné sur un cargo de la marine marchande suisse. Aurélie Mercier, une ex-inspectrice mutée à la municipale, reprend du service et se rend au Cap pour rapatrier Florian, un suspect que tout accuse. Lui clame son innocence et dit chercher Julia, sa petite amie.
On the high seas, a sailor is murdered on a Swiss merchant navy cargo ship. Aurélie Mercier, a former inspector transferred to the municipal police, returns to duty and goes to Cape Town to repatriate Florian, a suspect who is accused by everyone. He proclaims his innocence and says he is looking for Julia, his girlfriend.
