I'm currently reading a book titled A Pinch of Poison by Frances and Richard Lockridge (originally © 1941) that was part of their "Mr. and Mrs. North" series of mysteries.

Before that, I was reading an old Ellery Queen book: The French Powder Mystery, originally © 1930:

as well as a Robert Silverberg story: Blood on the Mink:

which originally dates back to 1962.