15 books in series

Pretty Little Liars

Pretty Little Liars is a 17-book series with 15 released primary works first released in 2006 with contributions by Sara Shepard.

Ali's Pretty Little Lies
Pretty Little Liars
Flawless
Perfect
Unbelievable
Pretty Little Secrets
Wicked
Killer
Heartless
Wanted
Twisted
Ruthless
Stunning
Burned
Crushed
Deadly
Toxic
The Liars