From the Publisher:
When evil strikes a loved one, it can make us crazy. We can't think rationally enough to get revenge ourselves, so we shouldn't. But Nero Wolfe ignores reason when someone guns down a close friend in cold blood. He vows to collar the killer personally, and it thrusts him into the gravest danger of his career. The case takes him 4,000 miles across the ocean to the hazardous mountains of Montenegro, where Communist cutthroats have also disposed of Wolfe's adopted daughter. Now they zero in on the world-famous detective himself.
Rex Stout: The Black Mountain. A Nero Wolfe Mystery. Introduction by Max Allan Collins. Bantam Books, ISBN: 0553272918 (September, 1993), 224 p., $4.99