Plot: While Sabatini is on the trail of Guaraldi and the diamonds, the Mafia Capitale investigation has reached a critical point: Ardenzi and the Mobile are closing in on the boss of the "middle world", the Zoppo, who operates under the aegis of the mysterious Architect. Meanwhile, the time has come for Isabella to face her stalker head-on, alone and without the support of Ardenzi and her colleagues