Aurélie, an inspector who clumsily let a young man suspected of being involved in the disappearance of his girlfriend go, learns that he was arrested on a Swiss merchant navy cargo ship for the murder of a sailor. Sent to South Africa to repatriate him, she discovers that the missing girl was a passenger on this cargo ship a few weeks earlier. She continues her investigation alone, facing resistance from the crew.
A policeman whose daughter has been murdered clashes with his mother over the identity of the killer. This violent disagreement, which reopens old wounds, will be the key to solving a murder much more complex than it appears. What if this tragedy paved the way for a potential reconciliation between a mother and a son that everything sets against each other?