"The Doorbell Rang," Previewed by Lewis Nichols, New York Times, October 24, 1965

From the New York Times, October 24, 1965:

"Nero has been solving sinister problems since "Fer-de-Lance" in 1934. "The Doorbell Rang" is the 30th Nero Wolfe book, or if you wish to add omnibus collections, the 35th Nero Wolfe book, both numbers as round as Nero is, in life, rotund. No one has ever bothered to figure officially the sales, but Nero has appeared in 22 languages, and Mr. Stout would give an unchecked guess that total sales have been about 40,000,000 copies."--Lewis Nichols