S2, E23: Aria, Emily, Hanna and Spencer are on the quest for answers of what Alison knew before she died and they might have just gotten a big lead when someone from Alison’s past appears. Duncan (guest star Lachlan Buchanan – Working Class, Hung) might hold the key to all of the girls’ answers, but can they trust him to let down their guard? And just when they feel like Duncan may be the only lead, Jason (recurring guest star Drew Van Acker) drops off a bag of Alison’s personal items that could be more than just a bag of junk. Meanwhile, Toby’s (recurring guest star Keegan Allen) return to Rosewood brings a surprise reunion that ends dangerously.