ABANDONED. Suspense thriller book where the suspected killer kept a diary (can’t remember if it was paper or audio) and he killed a victim with scalding hot water.

[Paul]

I am not a huge reader, but I thoroughly enjoyed this book and would like to “read” more. I “read” while I drive, so I listened to this book in audio version. I’m sorry that I can’t remmeber a ton of details, but there was a serial killer that would scope out potential victims, and would “talk to his diary” about the situation. If I remember correctly, he had these “diaries” hidden is his home. I also remember one victim that he tortured with scalding hot water, and would bring them just to the point of death. There was a huge plot twist at the end, where I think the killer turned out to be someone the character trusted, and was actually in a cabin with this person helping to “protect” them.
I really appreciate any help with these vague details I can provide.

[Ingo]

Maybe there are a few additional hints you can give us:
when did you read this book (timeframe), medium (Hardcover, Paperback, eBook, Audio), also maybe when you read it, wether it was new or old (or when was it released)? The answers will help us to help you.

One other thing, the plot twist you describe is a spoiler (imho), you should mark it so. For me this not a problem, but others might not want get spoiled. This is currently possible with the desktop (browser) version of Goodreads, not with a mobile app. You should see a link "some html is ok" you can click which describes how to mark spoilers and other things.

[Lobstergirl, au gratin]

Paul, are you still looking for this or did you find it?

[Kris]

No response, moving to Abandoned folder.

Paul (OP) was last active on the site in November 2018.