Philanthropist George Rohl is found dead after his head was smashed in. The list of suspects: his wife, his brother, and his assistant. But Ruby, a schoolteacher and friend to the assistant, doesn't think that's right. There's no way that's the list of guilty suspects. She thinks there's someone unknown who committed the murder, and she's going to find out who.  She dives in, tracking down leads and interviewing suspects, all while dodging the principal and grading homework. Can she find the murderer, or will the real killer go free?