In "The Black Mountain" Nero Wolfe's oldest friend and fellow Montenegrin Marko Vukcic is killed by a Yugoslavian spy, and Wolfe is compelled to go back to his homeland to bring him back to American justice.
In "The Black Mountain" Nero Wolfe's oldest friend and fellow Montenegrin Marko Vukcic is murdered by a Yugoslavian agent who has already made his escape from New York. Without hesitation, Wolfe is compelled to go back to his homeland to avenge Marko's death and bring the killer back to American justice.