The Pretty Little Liars Season 3 filming is moving along rapidly! In fact, it's going so quickly that the cast and crew are getting ready to start filming the Halloween episode (Season 3, Episode 13: “This Is a Dark Ride”), which (obviously) doesn't air until October.

Today, July 17, PLL writer Joseph Dougherty, who penned the episode, tweeted this pic of the script, saying, "We start shooting tomorrow."

Exciting! Hopefully this means the cast and crew will spill some details about the episode. Joseph has already confirmed that Mona (Janel Parrish) will be in it, and yesterday he tweeted a picture of the cast at the table read for the episode.

Catch an all-new episode of PLL on Tuesday, July 17 at 8 p.m. ET/PT on ABC Family.

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