Pretty Little Liars is like a puzzle, and we're always looking for any clue-sized piece to fill in the picture. What better source of info than the promos for each new episode? A close look often reveals potential secrets about the next week, which is why we've taken a magnifying glass to the preview of Season 4, Episode 4: "Face Time."

Here's what we've learned.

Aria goes investigating. Throughout the promo we see Aria walking in a dark location with a flashlight, and at :09 we see that she's in the mask maker's shop. It looks like she's investigating the shop. Is she looking for more familiar faces? But why does she appear to be alone? Is this related to the shot at :05 of Aria and Spencer spying?

Mask smash! At the very beginning of the promo we see someone smashing what appears to be one of the masks. Based on the shirt this person is wearing, we think it's Melissa, who is wearing the same thing later in the promo.

Hanna and Caleb. At :01 we see Hanna and Caleb looking up from a hug. They seem concerned. Why?

The Liars' bitterness. "Senior year is supposed to be the best year of your life," Spencer tells Emily. "If you survive it," Emily replies. They are clearly not happy.

Hanna will protect her mom. "I will do whatever it takes to protect my mom," Hanna tells Caleb at :06.

Money, money, money! At :07 Detective Holbrook shows Hanna a box full of money; she looks shocked. Is it somehow connected to her mom?

Melissa vs. Spencer. We also see a major Hastings confrontation. Spencer demands "answers" from Melissa, and we can't wait to see more!

A gun! At :12 we see someone with blue gloves handling a gun. They're the same kind of gloves Holbrook is wearing at :07. Could this be his partner?

Watch the preview for yourself below.

Credit: YouTube Photo: Pretty Little Liars Season 4, Episode 4 Preview: "Face Time" (VIDEO)

Did we miss anything important? Interpret something wrong? Share your thoughts in the comments below!

Find more Pretty Little Liars spoilers here.

Catch the next episode of Pretty Little Liars on Tuesday, July 2, 2013 at 8 p.m. ET/PT on ABC Family.

Rebecca Martin is an editor at Wetpaint Entertainment. Follow her on Twitter @BeccaDMartin.