Caleb and Toby team up to investigate "A" and what really happened the night of the lodge fire and encounter a source that points to a new possible identity for "Red Coat". Hanna struggles to act like everything is normal and her friends are unsure about how to help her. Aria worries about Mike... s behavior in light of an incident at school and Ezra struggles with how he now fits into her life. Meanwhile, The Liars are determined to find a new suspect in Wilden's murder and their tactics have unintended consequences. And, "A's" new plan threatens to send everything crashing down around one of the Liars.