little lies that liars tell

Pretty Little Liars STILL Unanswered Questions:

Who killed Mrs. D?
What was up with Wren w/that red coat drawing?
If Melissa said she realized she killed Bethany when Ali was found alive, how could Mona have?
Who was in the barrel?
When and how did Cece meet Sara?
How was Cece allowed in Mona’s room when she was a patient herself?
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