what Madisonâs friends were saying, but Madisonâs instincts were telling her something completely different.
âIs Dad in?â Madison asked, wanting to change the subject.
âHeâs in his office.â
âSee you later.â
Madison walked down the hall. The door to Hamiltonâs office was open, and she rapped her knuckles on the jamb to get his attention. Hamiltonâs office was as disorganized as his clothes. Papers were stacked seemingly at random on his desk, more papers stuck out from between the covers of the law reports that filled his bookshelves, and case files were spread across parts of the floor. Madison was always amazed at how such a sloppy person could be so organized in court. More than once, her father had astonished her when he broke down a witness with a razor-sharp cross-examination or cited a case, chapter and verse, from memory when he was arguing a legal point to a judge.
Hamilton didnât look up from his work when Madison knocked. To Madison it seemed that most dads would be dying to hear about their only childâs first day at school. Some days Madison felt like Hamilton didnât even know she existed. She knocked again, harder.
Hamilton looked up, confused. âHey, honey,â he said, after registering it was Madison knocking. He didnât seem to notice her black eye. Inwardly, Madison sighed.
âHey, Dad. Howâs the new case going?â
âItâs coming along.â
âDid you find out if Mrs. Shelby was my second-grade teacher?â
Hamilton sighed and rubbed his eyes. âShe probably is, honey. She taught at your old school.â
Madison was silent, crestfallen. Poor Mrs. Shelby. âIâve never known someone who was murdered before.â
âWe arenât sure if she was murdered,â Hamilton reminded her.
âSo they havenât found the body?â
âNo.â
âIn Max Stoneâs The Spy Vanishes , the missing CIA agent was hit on the head and got amnesia. Maybe Mrs. Shelby is wandering around and doesnât know who she is.â
âI guess thatâs possible.â
âHas the crime lab tested the blood on the knife yet? Maybe itâs not Mrs. Shelbyâs.â
âMaybe, but the crime lab says that the blood on the knife is Ruth Shelbyâs blood type.â
Madison frowned. Then she cheered up. âDonât a lot of people have the same blood type? Arenât there, like, only five, and most people have the main one?â
âActually, there are four blood types,â Hamilton said. âO, A, B, and AB, and they can be positive or negative. Mrs. Shelby is a B negative, which is the second rarest kind, and so is the blood on the knife. A little less than two percent of the population has that blood type.â
âTwo percent? That doesnât sound like that many.â
âWell, yes and no. There are around three hundred million people in the US, so two percent of three hundred million is six million people.â
âWow, so it could be almost anyoneâs blood on that knife.â
Hamilton laughed. âI wish you were on all my juries.â
âMaybe someone with her same blood type came in and kidnapped her!â
Hamilton rolled his eyes, but kindly. âIn a few weeks, when we get the result of the DNA test, weâll know if the blood is definitely Mrs. Shelbyâs.â
âDNA tests take that long?â
âYeah.â
âAnd they really work?â
âThey do. Only one percent of our DNA is different, person to person.â
âSo my DNA is ninety-nine percent the same as the presidentâs or a movie starâs?â
âYup, but one percent is different enough,â Hamilton said. âThe police take a sample of the blood found at a crime scene and a sample of the blood of the victim. If that one percent matches, they have proof that the blood is the victimâs blood, in this