E. Lockhart's WE WERE LIARS

A beautiful and distinguished family.
A private island.
A brilliant, damaged girl; a passionate, political boy.
A group of four friends -- the Liars -- whose friendship turns destructive.
A revolution. An accident. A secret.
Lies upon lies. 
True love.
The truth.

THE RADLEYS (no relation to Boo)

"Your instincts are wrong.  Animals rely on insticts for their daily survival, but we are not beasts. We are not lions or sharks or vultures. We are civilized, and civilization only works if insticts are supressed.  So do your bit for society and ignore those dark desires inside you. -The Abstainer's Handbook (second edition), p. 54"