Need something new-something that going to scare me reading

I have read Haunting and Hunting of Adeline and Credence by Penelope Douglas. I still feel these were vanilla for me. I want something that has hella triggers. That makes the dark reader squirm. I do like when the MC take control over the FC. I did also enjoy the cat and mouse chase of Haunting of Adeline. I want the worse of the worse. The darkest of them all. Something I could only read at home.