It turns out Mona Vanderwaal's confession wasn't so airtight in this sneak peek of Pretty Little Liars Season 4, Episode 9: "Into the Deep" (August 6).
07.31.2013 / 12:00 AM EST by Rebecca Martin
Related: Pretty Little Liars, Sneak Peeks, Hanna Marin, Spencer Hastings, Mona Vanderwaal, Pretty Little Liars Season 4
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