The fourth season of the American mystery drama television series Pretty Little Liars began airing on ABC Family on June 11, 2013.

The girls begin looking for answers that could lead to Alison's whereabouts while dealing with the aftermath of Detective Wilden's murder and "A" intervening in their personal lives.

Spencer (Troian Bellisario) helps Toby (Keegan Allen) with finding answers about his mother's untimely death while trying to keep him from falling victim to "A"'s schemes.

Aria (Lucy Hale) tries to break free from her feelings toward Ezra (Ian Harding) by pursuing a relationship with Jake (Ryan Guzman).

The girls search Ravenswood to find her but she meets them back at Rosewood and is revealed as the "good" Red Coat, telling them she is still in danger, so she can not return until it is safe.

Meanwhile, Spencer begins taking amphetamines to help cope with the workload from school, but develops a dependency on them, igniting a drug problem that, unbeknownst to the others, occurred before.

Aria grows closer to Ezra, whom the other girls believe is "A", but breaks it off after learning that he has actually been writing a book about Alison's disappearance and knew her when they met.

Hanna mends her broken heart by pursuing a relationship with Travis (Luke Kleintank) and an interest in mystery novels, which lead to a friendship with Detective Holbrook (Sean Faris).

Suspecting that they can find clues at Ali's house, Hanna volunteers the girls to Jessica's bridal fashion charity show.

Mona learns that the police have found high-heeled prints at the scene of Wilden's murder, making Hanna suspicious of Ashley's whereabouts.

Toby tells Spencer he returned the "A" van back to "A" in exchange for medical documents outlining his mother's status on the night of her alleged suicide.

Melissa explains that Wilden set the fire at the Lodge at Thornhill and that she sent Jenna and Shana to watch over Spencer and her friends.

On a college visit, Spencer discovers a phone line in a room of the Gamma Zeta Chi sorority house that matches the number Tippy was chirping in episode 2.

Hanna ventures behind the sorority house into the back woods and tries to bury the gun but the police show up to arrest her before she can discard it.

Clues from the sorority house send Spencer and Toby to Ravenswood where they find the ex-house mother Mrs. Grunwald who provides no help.

After Ashley Marin is denied bail, Hanna seeks Mona's help in plotting her biggest lie ever: a false confession to murdering Detective Wilden.

Aria finds out that Cece got kicked out of college due to Alison blaming her for pushing the girl down the stairs at the frat party Ali took the Liars to.

In the reflection of the mirror inside the box, you see Red Coat wearing the "Alison" Mask staring at Hanna, but she doesn't notice.

Following an observation from workers fixing the heating system, Mrs. DiLaurentis and Emily find Red Coat's hiding place-her basement crawl space.

Aria, Emily, Hanna and Spencer decide to use Ali's journal in order to get her to come back and fix things to normal.

Aria shows Emily and Hanna the file Ezra gave her in secret about Spencer's previous addiction two years ago.

Mike and Mona grow closer and Aria distances herself from Ezra, telling him she can't help him anymore.

When Hanna apologizes to Travis for kissing him, he tells her that his dad is in court, accused of taking bribes from Wilden in exchange for business leads.

Spencer is shaken when she finds a pile of dirt at the edge of her bed and an "A" note accusing her of digging Ali's grave.

Emily also confronts Jason, recently released from rehab, who tells her that Jessica had suspicions about Spencer prior to the night Ali disappeared.

Veronica fires Dean when he appears to be "slacking" on the job - he fell asleep on top of Spencer at the edge of the couch.

Ali confessed that she drugged the girls by dropping sleeping pills into the communal drinking cup in the barn - Spencer didn't fall asleep with the others because she was on amphetamines.

Ali also explained that she went home thinking she had silenced "A" and saw her mother gasp from inside the house before she was hit on the head with a rock.

Club commented on how the show's focus on shocking moments are more appealing than big picture, writing "It might have been fun at one point, but trying to keep track of who's in or out with A is an exhausting exercise that rarely yields satisfying results anymore".

It's at its most fun when it breezes past the big picture, gets lost in its own illusions, and lets a talking parrot steal the spotlight.