Pretty Little Liars: The Perfectionists is an American crime thriller mystery drama television series created by I. Marlene King. The series is the third television series on the franchise. It's loosely based on the 2014 novel The Perfectionists by Sara Shepard, but serves as a spin-off and standalone-sequel to Pretty Little Liars. The show premiered on Freeform on March 20, 2019 and concluded on May 22, 2019. In September 2019, the series was canceled after one season.