Gothic libraries, tragic geniuses, and friend groups one bad decision from a body count. Start with the book that basically invented the genre.
The Secret History
Donna Tartt
Ninth House
Leigh Bardugo
Babel
R.F. Kuang
If We Were Villains
M.L. Rio
A Deadly Education
Naomi Novik
The Atlas Six
Olivie Blake
Catherine House
Elisabeth Thomas