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 9: "Into the Deep" (August 6).

Here's what we've learned.

Jenna and Shana at a party. The synopsis of the episode says that Jenna and Shana show up to Emily's birthday party, and we see that at :01.

Does Jenna know Alison's alive? At :03 Aria says, "She knows Alison's alive," and Spencer replies, "Either that or she knows who killed her." We're guessing this conversation is linked to this exchange between Jenna and Shana, which Aria and Spencer overhear.

Will Jenna spill? At :04 Aria tells Jenna, "You have to tell me," and Jenna shoots back,"I don't have to tell you anything." Given her history with the Liars, that's fair enough.

Is Ashley out of jail? At :06 we see a shot of Hanna, and in the background we see two people that look like they could be Hanna's parents talking. Of course, it's hard to tell if it's really them.

Will the circle be unbroken? Remember this phrase? Because it's back at :07; it appears Mona has returned to Radley.

What does Shana think? "She's dead," we see Shana tell Spencer :09. Is she talking about Ali, or someone else? "You could be next," Spencer shoots back. "Or me." Shana replies, "All I know is nothing good ever comes from being around you four." Again, fair enough.

Mona questioned. We also see Mona being questioned by the police at :10.

Ambulance. We never like seeing an ambulance, but there's one at :11.

Red Coat. We see Red Coat at :13. How exciting!

Does something really bad happen? "Someone wanted to make sure we didn't find out what she knows about Alison," Emily says. Who's the "she"? Jenna? And how far does "someone" go to silence her? Could we possibly have another death on our hands? We see Emily sitting, pensive, by a lake. Related?

Aria and Jake get close. Really close at :19.

Hanna gets a call from Mona. At :19 we see Hanna gets a call from Mona. Does the original "A" get her phone back? Is someone else calling from Mona's phone?

Spencer in danger? "Have you seen Spencer?" Aria asks at :21, and at :22 Emily screams "Spencer!" and runs towards what looks like a drowned (or drowning) body. Of course, we can't be sure it's actually Spencer. Could Jenna be the one in the lake? Someone else?

Watch the preview for yourself below.

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, August 6, 2013 at 8 p.m. ET/PT on ABC Family.

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