![The Last Enemy](http://image.tmdb.org/t/p/w185/wI8lY5Pprvgg3RPjV1HPANykrFx.jpg)
A terrified Yasim confronts Stephen, fearing that Michael was murdered because he was trying to prove a link between a Hepatitis B vaccine used in the refugee camps and the disease that killed Nadir. Meanwhile, Nye is out on the Afghan-Pakistan border investigating the site of Michael's death, and Russell drops a bombshell.