Sherlock Files: The 100-Year Old Secret / Tracy Barrett 157 p.

Xena and Xander Holmes believe they will be bored living in London-- until they discover that they are related to Sherlock Holmes. Life is much more exciting when they get his unsolved casebook.  Using 100-year old clues, they begin investigating his case of the missing painting.  Using interviews, following leads, and using logic to put 2 and 2 together, they find the long lost painting.