"Bright, brave, simple, natural, delicate. It is the most artistic and most original thing that its author has done.... We can heartily recommend 'A Duet' to all classes of readers. It is a good book to put into the hands of the young of either sex. It will interest the general reader, and it should delight the critic, for it is a work of art. This story taken with the best of his previous work gives Dr. Doyle a very high place in modern letters."--Chicago Times-Herald.