The series stars Daniela Ruah (known for NCIS: Los Angeles ), who recently returned to Portugal to film a second season.

It portrays Mata Hari not just as a double agent, but as an independent woman who defied the social conventions of her time.

Reviewers often highlight its accessibility and the way it explores the "mystery" of love and faith. Other Notable Mentions A Espia Portuguese Edition - mchip.net

It captures Lisbon as a "nest of spies," where the city’s neutrality made it a hub for refugees, diplomats, and double agents.