The body of an unidentified man, in jogging clothes, is left on the steps of the University Hospital of Lille, in a state of brain death. No trace of who dropped it off. The only clue: a gray van, spotted on surveillance cameras. On the Invisibles brigade side, the clues are slim, but they find the identity of the jogger. A bad guy, according to many people. While at Duchess and Ben's, the situation becomes tense, a cop from the IGPN arrives to monitor the Invisibles group, which is in the crosshairs of the hierarchy... Elsewhere, we discover little Stella, seriously ill. Stella is worried: her father is more and more strange, and tense. Besides, what does he do with his days, locked up in the annex at the bottom of the garden?