'Pretty Little Liars' Sneak Peek: Spencer Heads to London

Oliver Kieran-Jones plays Colin on Pretty Little Liars. Photo Credit: ABC Family//Eric McCandless

The girls’ actions create a devastating aftershock for one of the Liars in “Bloody Hell,” an all-new episode of of Pretty Little Liars, airing at 8 p.m. ET/PT on ABC Family.

Equipped with their new information about Mona, the Liars decide they need to speak to Alison. But once the truth is out there, Aria quickly learns that Mike’s involvement with Mona and this new revelation could have serious repercussions for her family. Determined to keep Mike safe and get Ali out of jail, the Liars intensify their search for information on “A.” Meanwhile, Spencer heads to London for an important college interview, and Alison looks to someone surprising for help with her murder trial.

Watch a sneak peek video below:

'Pretty Little Liars' Sneak Peek: Aria Is Concerned About Mike

Cody Christian plays Mike Montgomery on Pretty Little Liars. Photo Credit: ABC Family/Gilles Mingasson

Red flags are raised when a stranger arrives in town in tonight's episode of Pretty Little Liars, airing at 8 p.m. ET/PT on ABC Family.

Aria, Emily, Hanna and Spencer have been burned before by newcomers to Rosewood, so it's no surprise the four ladies are wary when someone new crosses their path. Spencer lets down her guard a bit as she spends more time with Jonny, and Emily continues to try and figure out Talia as she keeps getting mixed signals from her co-workers. When Mona's friend Lesli shows up in town, Hanna is tasked to get her back story and find out if Lesli is really who she says she is. Are the girls wise to keep an eye on everyone, or can they allow a bit of comfort room without worrying it is an "A" trap?

Meanwhile, Aria becomes concerned about Mike's (Cody Christian) recent behavior and Holbrook (Sean Faris) returns to town.

Mike and Aria talk about Mona in the sneak peek video below: