[1] Marco Tancredi (Raoul Bova) is an ex-parachutist from the Italian special forces who retired into civil life traumatised by his disastrous final mission in Yemen.
He learns that Lidia had been working for the Italian anti-terrorist department, whose leader Carlo Fulgeri (Massimo Venturiello) invites him to join it.
He finds a clue leading him to a flat in Bucharest, where he is arrested by the Romanian secret service, but Giada, sent by Fulgeri to keep an eye on him, helps him escape.
Another clue leads to a Russian former secret agent, but he is killed by polonium poisoning before he can tell them more than that Lidia had been investigating circumstances relating to Tancredi's last mission in the Yemen.
With the help of the Gianlisi and the anti-terrorist department's computer specialist Brain (Stefano Fresi), Tancredi learns the identify of the mysterious assailant.
The adversaries are directed by Giovanni Sgrò (Francesco Foti), right-hand man of Licio Mariani (Vincent Riotta) for whom Filippo has been working.
They decide to visit him in the search of information; meanwhile Sgrò blackmails Filippo into murdering Tancredi, Gianlisi and his sister; but drawing the line at the last of these, he keeps her with him.
Here he encounters Sgrò but (with the help of Giada, Gianlisi and a disaffected engineer (Clotilde Sabatino)) thwarts his plans, leading to the destruction of the monastery.