Trio for Blunt Instruments is a collection of Nero Wolfe mystery novellas by Rex Stout, published in 1964 by the Viking Press in the United States and simultaneously by MacMillan & Company in Canada. The book comprises three stories:"Kill Now—Pay Later", serialized in three issues of The Saturday Evening Post "Murder Is Corny", previously unpublished; the last Nero Wolfe novella to be written, and the last published in Stout's lifetime "Blood Will Tell", first published in Ellery Queen's Mystery Magazine

"Murder Is Corny" is a Nero Wolfe mystery novella by Rex Stout, first published in April 1964 in the short-story collection Trio for Blunt Instruments. It was the last Nero Wolfe novella to be written, and the last published in Stout's lifetime.