Trail of Cthulhu is a very good RPG! It uses the Gumshoe system which is tailor-made for running investigative stories and procedurals, and its twist is as a classic horror setting. It's really very very good and the Gumshoe system is one of my favorite tabletop systems ever. So definitely check out the bundle!
https://www.humblebundle.com/books/trail-cthulhu-pelgrane-press-books