I'm not sure specifically who 'Peter Brash' is without more context. It could be a common name. Maybe he's a local figure in a certain community, an artist, or someone with a personal story known only to a small group. There's not enough information here to give a detailed back story.
Myles Kennedy is a talented musician. In 'Rise Today', his back story might be related to his journey in the music world. He has likely faced many challenges and opportunities that have shaped him as an artist. His growth as a singer and songwriter could be a part of this back story.
One possible element could be his family. Maybe he comes from a large family that influenced his values and character. Another element might be his education. If he had a good education, it could have opened doors for him in his career.
Jenna is likely the main character in the story. She could be a young girl, a teenager, or even an adult. Since the story is named after her and the black cat, she's probably the one whose experiences are central to the plot.
The back story might involve his musical evolution. He could have started with a certain musical style and gradually developed into the sound we hear in 'Rise Today'.
I don't know what you want to know about Jenna's novel. Please provide more background and context information so that I can better answer your questions.