Lovely cover on this double-header. We are all familiar with the Hound but the case of the Missing Heiress appears to be adaptation of a 1947 episode of the Sherlock Holmes radio series with John Stanley as Sherlock. The whole radio series is in the public domain if you are interested.
The Hound is competently, if a little statically, presented by Frank Giacoia. It’s a good tale with Watson having a wider role than in most. Missing Heiress is a gem of a find. Holmes is almost incidental to the plot of a scheming woman who has set her heart on something that she wants. Frank’s art appears more fluid and engaging on this one.
Link to the book:
Super Detective Library 078 - Sherlock Holmes and the Hound of the Baskervilles