Jenna throws a party to die for. Aria, Emily, Hanna and Spencer think Jenna’s birthday party could be the perfect setting for “A” to strike and for them to catch their tormentor in “That Girl Is Poison, an all new episode of ABC Family’s hit original series “Pretty Little Liars,” airing Tuesday, July  10th (8:00 – 9:00 PM ET/PT).

THAT GIRL IS POISON

Jenna’s extravagant birthday party seems to be too good to be true and Aria, Emily, Hanna and Spencer think something else might be up – especially when it turns out that Garrett is getting a pass out of jail to visit his ailing mother on the same night. The timing can’t just be a coincidence; the Liars are convinced it all has to do something with “A.” With Emily getting an insiders’ view working the party, Aria working the crowd as a party-goer and Spencer staked out at the hospital, what could go wrong? The answer is – everything.

Meanwhile, Hanna’s wallowing through heartbreak leads her to a shocking discovery.

“Pretty Little Liars” is produced by Alloy Entertainment in association with Warner Horizon Television and is executive produced by I. Marlene King, Oliver Goldstick and Leslie Morgenstein. The series stars Troian Bellisario, Ashley Benson, Tyler Blackburn, Holly Marie Combs, Lucy Hale, Ian Harding, Laura Leighton, Chad Lowe, Janel Parrish, Shay Mitchell and Sasha Pieterse.