Suspenseful thrillers

I'm looking for a first person game that's really suspenful/mystery. I'm not really looking for horror but somthing scary. After finishing firewatch I really liked the mystery behind it and liked the exploration of it so to speak. So somthing like firewatch mixed with Alan Wake. So what do you guys think? Any recommendations?

SOMA was really good story wise. I can't say its super scary though. It can be at times

stalker and betrayer come to mind.

Both those games look awesome! Betrayer was a very cool time period and Stalker looks like a more badass Metro