Ava, Caitlin & Dylan Think They Know Who Killed Nolan on 'The Perfectionists'

Mona (Janel Parrish) looks like a million bucks in her red dress in this still from Pretty Little Liars: The Perfectionists.

In “Lie Together, Die Together”, on the night of a school gala, the gang (Sofia Carson, Sydney Park and Eli Brown) is convinced they know who killed Nolan (Chris Mason) and set out to prove it.

However, Dana continues to complicate their lives by exposing a critical secret between the Perfectionists.

Pretty Little Liars: The Perfectionists airs TONIGHT, Tuesday, May 15th @ 8PM ET/PT on Freeform.