Pretty Little Liars: The Perfectionists 1x02 "Sex, Lies and Alibis" Season 1 Episode 2 Promo - In the wake of Nolan’s murder, Ava, Caitlin and Dylan join forces to give themselves a credible alibi on the night in question. Alison goes toe to toe with Dana Booker, BHU’s new head of security, who is suspicious of Nolan’s “perfect” posse. And Mona starts slipping into old habits while wrestling with a guilty conscience.