Drake is asked by a group of African intellectuals to intercede in their country's troubles before it develops into genocide. He poses as a gunrunner to gain access to the leader of the trouble, finding an ally in the most unlikely of places.
What would have been a run of the mill episode is made noteworthy by its nearly all-black cast (McGoohan and Chilcott are the only exceptions). This at a time when black actors were very limited in roles--just look at the credits of the actors involved, for example. Also a time when many African nations were just gaining independence. Ironic that it turned out to be the last episode of the first series. . .