Someone has murdered Nero Wolfe's best friend Marko, owner of Rusterman's, the only restaurant Wolfe will frequent. More than food is at stake -- Marko and Wolfe share a mysterious history in their birthplace, the mountains outside Sarajevo. Marko is one of the very few who Archie has heard call Wolfe by his first name. Wolfe sets out to find the murderer and the adventure leads back to the Black Mountain, the place of his origin. Wolfe puts out more physical exertion in this one book than in all the others put together, which is one of its charms. But what really works for me is that he casts Archie in the role of his son for the sake of their cover story -- bringing to the front some of the subtle aspects of their "normal" relationship in the old brownstone. It's a stretch for everyone -- readers included -- but the emotional borders are widened as in no other Nero Wolfe novel, and the result is extremely satisfying. Stout's brilliance has, in my opinion, al! ways resided in great measure in his ability to suggest the emotions of his characters through a small action or phrase that lets the reader in without spelling it all out. In "The Black Mountain" Stout has brought to the surface the truth of the Archie/Wolfe relationship in full color with absolutely no pandering, and no cheapness.