When the high-speed train running the Milan-Rome route enters Termini station, the police are faced with a horrific surprise: the passengers in the distinguished class are all dead.
The first to enter the disastrous carriage is Colomba Caselli, a deputy police chief with steel muscles and a fragile soul. The initial evidence suggests it is an act of Islamic terrorism, followed by a video in which two men claim responsibility in the name of ISIS. Colomba, however, realizes that something doesn't add up and understands that the only thing she can do is seek the help of the man who manages to see through the fog of lies and deception: Dante Torre.
Colomba and Dante haven't spoken for months, ever since he, after the death of his torturer, the man who wanted to be called "the Father," disappeared behind his ghosts. Convinced that a conspiracy has been set up against him, he has thrown himself into the search for the moral instigators behind the Father and the mysterious person who called him claiming to be his brother. A person whose existence only he believes in...