Thanks, Andrew, for calling attention to this story. It's unusual for a comic story to be a classic whodunnit featuring the collection and analysis of clues and the elimination of red herrings, while playing fair with the reader. From the way the panels are arranged this appears to be one of the Shane newspaper stories. It would have been expecting a lot of a reader to keep the complex plot straight from day to day, but the story's perfect for a pocket library.
Link to the book:
Super Detective Library 102 - The House of Mystery