A former colleague of Dorn joins the investigation into the theft of polonium from a British nuclear power plant.
A string of teen suicides that may be linked to Internet bullying are investigated, but gets complicated by Sebastian being investigated for corruption.
While Hickman's life hangs in the balance, Eva and Sebastian search for Anne-Marie.
Hickman is implicated when a woman is found dead, with another missing. Meanwhile, Dorn discovers information about the killer of Louis and Rebecca's son.
The kidnapping of a drug lord's daughter leads to the team investigating mass shooting in Slovenia and Italy.
When Carl is taken hostage while investigating a bank, the remainder of the team must figure out the motive.
Whilst in Florence, Eva discovers a similar kidnapping and the finances of the missing boy's father reveal that all may not be as it seems. Meanwhile, Sebastian's career could be at risk when a secret from his past comes to light.moreless
When the team goes after the kidnappers of a wealthy teen, Anne-Marie discovers to another case, while Louis and Dorn uncover a connection to Alexander Dimitrov.
When Sebastian links a body and abandoned car, the ICC discover a truckers' underground fight club.