Pretty Little Liars (2008–2014) — book series in order

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Wicked (2008)
Killer (2009)
Pretty Little Liars Box Set (2009)
Wicked (2011)
Burned (2012)
Pretty Little Secrets (2012)
Stunning (2012)
Ali's Pretty Little Lies (2013)
Deadly (2013)
Vicious (2014)