'Pretty Little Liars' Season 4 spoilers: Zack is back, more Sasha Pieterse and 'Dial M for Murder'

pretty-little-liars-season-4-sean-faris.jpgDetails have been flying online about the first four episodes of "Pretty Little Liars" Season 4. Let's take a look at what we know so far.

The above photo is the first official picture released, via TV Guide. It shows new character Detective Holbrook, who works for the Pennsylvania State Police. Actor Sean Faris tells TV Guide that Holbrook and partner Linda Tanner are in Rosewood "to investigate some of the mysteries that seem to elude the local police."

Speaking of Det. Tanner, Roma Maffia has been cast in that role and below is a picture director Norman Buckley tweeted from the PLL set.

RELATED: PLL Season 4 behind-the-scenes pics

What else do we know? Well, Buckley has also tweeted the below picture of Steve Talley, which means Ella's love interest Zack is back.

Buckley adds on Twitter, "We're doing a scene this morning on #PLL inspired by #DialMForMurder on the very soundstage where #DialMForMurder was shot."

Those PLL writers and directors love their Alfred Hitchcock. "Dial M for Murder" is one of our faves, you should check it out.

Creator Marlene King has also been dropping some hints on Twitter. "Season four of PLL = answers. You will learn so much. Ask and it is given," writes King. "Are you ready to see a lot more of @SashaaPieterse in season four of #PrettyLittleLiars?"

Finally, PLLDesignGuy teases, "Rosewood is about to get allot scarier for our dear Pll 's - excited for tomorrow's shoot! #pll #darkspaces."

Um, how much scarier can Rosewood get for these girls? "Pretty Little Liars" returns June 11 on ABC Family. Check out all the behind-the-scenes pics of PLL shooting its first few episodes in our photo gallery.

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Photo/Video credit: ABC Family, Instagram
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