Following the final episode of series two, the BBC subsequently announced that the series had been commissioned for a third run. Michelle Keegan, Luke Pasqualino and Ben Aldridge were later confirmed to be returning to the cast, with newcomer Shalom Brune-Franklin and Rudi Dharmalingam being amongst the new cast members for this series. Unlike previous series, a total of twelve episodes were commissioned; to be shown in three blocks of four episodes, each covering a different "mission". Filming for this series took place in Nepal, South Africa and Malaysia. The first episode of Our Girl: Nepal is due to be broadcast on October 10, 2017.
Maria Eugenia Sampedro (Mariu) by mistake is caught up in the murder of Coralia Galvez, Emiliano Galvez's (Carlos Montilla) beloved wife. In a story of obsessive persecution, frustration, passion and desire, Mariu will fall in love with Emiliano, her prosecutor. She must choose between keeping the love of her life through silence or loosing him by revealing her true identity. 埃米利亚诺是委内瑞拉著名的爆破专家、化学博士，并即将取得律师学位。他被称为——“没有警察身份的警察”。 玛丽欧是个美丽、活泼、性格刚烈的女孩子。但生活的艰难使她不得不常常与富人斗争。此时母亲由于失业，心情沉重而犯了哮喘病。玛丽欧的弟弟和妹妹一筹莫展，一家的重担都压在了玛丽欧的身上。 故事就发生在两个人之间。