What is the turning point in the book Pretty Little Liars?

There's more than one climax in this book . When maya ( emily's grlfriend ) unearth alison's body in her backyard. And ALison's Funeral where 'A' sends the girls another scary text posing as ALISON : I'm stll here bitches and i know everything. -A. hope that helped !!!!!!!!! oh and if you did not read the Pretty Little Liars book, but you watch the tv show and want to know who A is or who kILLED ALISON suggest you read all of the pretty little liars books , because the books are differnent from the tv show .