Mistborn. Wouldn't say it changed my life but it really put into words how I feel about religion so I could better communicate it to others. Don't want to spoil anything for anyone but I personally thought the story wrapped up well.
Professionally it was Radical Candor by Kim Scott. I was a struggling new manager from an individual contributor role and it really helped me develop a mindset and ability to set expectations but at the same time assist with their growth.
Hate to see this. This was my QB for half of my life and to see him likely go out like this makes me sick.