Do Not Disturb

S6 E15: Convinced that Sara Harvey (recurring guest star Dre Davis) is behind the new threats, the Liars work together to find evidence of Sara's involvement before they go to the cops. Caleb puts together a plan with Hanna to fight back against the new stalker by using the security footage tapes. Meanwhile, Aria gets unexpected news from her family, and Ali comforts Emily in her time of need.