On the Classic Mysteries podcast this week, you'll find a review of Rex Stout's "The League of Frightened Men." It was the second Nero Wolfe novel, first published in 1935, and it's a remarkable book. You can listen to a full review here.
Many years before the events in the book, a young Harvard student, Paul Chapin, was seriously and permanently injured as the result of a hazing incident involving a number of older students. Now, those older students are dying, one by one - possibly being murdered by Paul Chapin. The terrified men, calling themselves "the League of Frightened Men," come to Nero Wolfe, asking him to stop Chapin from terrorizing and murdering them.
Paul Chapin is one of the most interesting and memorable characters to come out of any of the Nero Wolfe books, and the resulting mystery that surrounds him is one of the most satisfying in any of the Nero Wolfe books. The characters of Wolfe and Archie (and the other regulars) were still being formed in this book, and there are rough edges and some jarring notes, but they do not distract from the main story of the book - nor do they distract from the character of Paul Chapin. It is a thoroughly enjoyable and satisfying book.