Gilberto Ballarin's body is rescued by police divers in the waters of the Venice lagoon. Deputy Commissioner Elena Zonin believes that the young man was kidnapped to be put up for sale on the web by a paedophile network.

Little Angelo escapes from the family home where he lives and goes to Venice, convinced that he can meet Elisa, a girl with whom he is communicating online.

Angelo awakens in a locked dark room. Elena is encouraged by her son Diego and goes above Misuri's head to obtain permission to resume the investigation.

Angelo gets immediately recaptured by his jailer. Elena and Daniele follow a lead at a prestigious music school.

Daniele and Elena find a dead body. Angelo's disappearance is reported. Giulia digs into Elena's past and come across vital information.

Elena and her team infiltrate an online chat and discover a farmhouse where many other children have been kidnapped and captured over the years.