Pretty Little Liars: The Perfectionists is an American crime thriller mystery drama television series created by I. Marlene King. The series is a sequel to Pretty Little Liars and was loosely based on the novel The Perfectionists by Sara Shepard. The show premiered on Freeform on March 20, 2019 and concluded on May 22, 2019. It is the second spin-off series of Pretty Little Liars and the third and final series in the Pretty Little Liars franchise.