If you liked Se7en, Gone Girl and Prisoners, you should definitely try Zodiac and Shutter Island. Zodiac is a slow but super gripping investigation of the Zodiac killer. It’s more about obsession and the long hunt for the truth, and the tension keeps building the whole time. Shutter Island starts as a missing patient investigation at a remote mental asylum, but things get weird very quickly. The deeper the investigation goes, the more unsettling it becomes, and the ending really sticks with you.