What book in the pretty little liars series do you find out that Ali is not dead?

How many senators are there in Canada 2009? What are two other inventions that came from ancient China besides block printing? Why was the resistance of each individual resistor measured? Does Wellbutrin causes dizziness? If you eat 500 calories a day how many pounds will I lose in 2 months? What is the Initiation of Ascension? On 97 Lincoln mark 8 how can a person raise the car for towing when it's 1 inch off the ground can you fill the air suspension manually? Why are scientists discovering new kinds of technology now and not in the past? What is the synonym for couture? What body of water forms the southern cost of Nigeria? What is the definition of base ingredients? Location of the Automobile used in the movie The Yellow Rolls-Royce? Why do objects heat up if they are moving faster? Rodney is 3 times as old as his sister A year ago he was 4 times as old How old are Rodney and his sister now? At which phase of menstural cycle pregnancy is most likely to occur? What is the area of Saint-Pierre-à-Arnes? What did William Harrisons campaign slogan tippecanoe and tyler mean? What is the shelf life on a five gallon bottle of water? How long is 1500 meter race track and field on 200 track and 400 track? What Symbols did Rumi use?

What book in the pretty little liars series do you find out that Ali is not dead?