Lost book 'To Kill a Mockingbird' with blue cover and handwritten note on first page on a train to Leeds.

I lost my book 'To Kill a Mockingbird' while I was on a train traveling to Leeds last Saturday. I remember having it in my bag when I left home, but I couldn't find it once I settled into my seat. It has a blue cover, and there’s a handwritten note on the first page. I'm really hoping to get it back!