In the ideal town of Rosewood, sweet smiles hide the darkest secrets... A year has passed since the fire in the DiLaurentis house in the Pocono Mountains. Aria, Spencer, Hanna and Emily are desperate to get their old lives back. But all their hopes are dashed when they start receiving messages again... from Ali, who knows what happened during the girls' vacation in Jamaica. The friends should have realized long ago that all secrets eventually come out. Full of unexpected twists and shocking revelations, Collateral is the ninth book in Sara Shepard's bestselling Pretty Little Liars series.