A famous businessman is murdered at his home, stabbed in the heart but the murder weapon is never found. The police suspects 4 people- the nanny, the cook, the music tutor, and the driver. The killer has left notes with clues in every room. There are notes found in the store room, under the sofa, on the piano, and in the bathroom closet. All the notes have one message: "The clues are in the notes". Who was the murderer?
The music teacher- the knife was in the piano where the music "notes" are found