A breakthrough in the case leads Carlo and Malik to a community of immigrants living in an old factory. Malik goes on a risky mission alone.

As the team investigates the murder of a young woman found inside a piece of luggage at the airport, Carlo contends with buried secrets from his past.

The hunt for a killer who stabbed a nun inside a sex shop takes a perilous turn. Back at the station, the team meets Santagata's successor.