The hundred-year-old secret / by Tracy Barrett.
Xena and Xander Holmes, an American brother and sister living in London for a year, discover that Sherlock Holmes was their great-great-great grandfather when they are inducted into the Society for the Preservation of Famous Detectives and given his unsolved casebook, from which they attempt to solv...
New York :
|Series:||Barrett, Tracy, 1955- Sherlock files. Cases: unsolved ;
Walker Library - Curriculum Collection - Juvenile - 3rd Floor