Anyone know of any physicological books?

I'm referring to things like,"Black Swan",or anything like that. I'm currently reading Stephen King's "Full Dark,No Stars", & this is the first Stephen King book I've read! His work is very impressive,& I look forward to finishing it,but I still want a physicological thriller. Not to gorey,but enough to give you chills & leave you wondering. Anyone have any recomendations? (By the way,I'm 13 & look how mature I am! :DDDD),but in all seriousness,I am looking for a good book of the physicologic genre.