Diamant 13 is a 2009 French-Belgian-Luxembourgish film noir co-written and directed by Gilles Béhat.

The film was nominated for a Magritte Award in the category of Best Original Score for Frédéric Vercheval in 2011.

One day he is present when a criminal takes a female hostage in order to use the woman as a human shield.

The hostage remains unharmed but Mat knows all too well his action could have gone awry very easily.

Franck has switched sides a long time ago and feels Mat would now be ready to condone this.