Overseas Police Adviser Peter Craig, on a cruise bound for Naples, stops in Lisbon to catch up with Ferreira, a former colleague who now runs a department of the PIDE security service.

Ferreira requests that Amanda be questioned by his men before being released; Craig, mindful of avoiding a scandal, insists that she instead return to the Embassy to be deported immediately.

Craig's plan to continue his cruise is frustrated as the ship is docked for repairs, and he reluctantly agrees to help with the search for Amanda, which leads first to her ex-boyfriend and then to a villa outside the city.

At the villa, Craig discovers Joao's corpse and confronts Amanda, who explains that he was killed by a Russian intelligence officer, Rogov, under cover as Oxford professor Milo Janek, who had recruited her two years earlier as a mole because of her links with the Embassy.

As Craig returns to the Embassy, Ferreira telephones to say that Rogov committed suicide in the prison hospital, but that the PIDE had collected useful evidence from his belongings and could still shut down the local revolutionary group.