The Case: As a bolt of lightning flashed above Black Mourning Castle, a scream echoed from the den of Lord Hooke. When the upstairs maid peered through the door, an arm reached for her neck. Quickly, the maid bolted from the doorway, locked herself in the library, and telephoned the police. Inspector Holmes arrived to find a frightened maid and the dead body of Lord Hooke. Apparently, the lord had been strangled. The inspector quickly gathered evidence. He noted blood on a letter opener, even though Lord Hook did not have any cuts or abrasions. The quick-thinking inspector gathered all the members of the family and began taking blood samples. The chart below shows the relatives who were in the castle at the time of Lord Hooke's murder.