Shay Mitchell and Tammin Sursok looked shocked in this new still from Pretty Little Liars.

In two weeks, a whole new episode returns with “That Girl Is Poison” where Jenna’s (Sursok) extravagant birthday party seems to be too good to be true leaving Aria (Lucy Hale), Emily (Mitchell), Hanna (Ashley Benson), and Spencer (Troian Bellisario) thinking something else might be up – especially when it turns out that Garrett (Yani Gellman) is getting a pass out of jail to visit his ailing mother on the same night.

The Liars are convinced everything happening has to do with “A,” so the girls decide to take matters into their own hands. Emily ends up getting an insiders’ view working the party, Aria works the crowd as a party-goer and Spencer stakes out at the hospital. Meanwhile, Hanna’s wallowing through heartbreak leads her to a shocking discovery.

“That Girl Is Poison” airs Tuesday, July 10 @ 8PM ET/PT on ABC Family.

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