Ali's return in "Pretty Little Liars" season 4 episode 16, "Close Encounters" was one of the coolest thing that happened after the show returned. Now, season 4 episode 17, "Bite Your Tongue" is here. Will it live up to the expectations of fans? The spoilers, sneak peeks and promo of "PLL" season 4X17 certainly feature some cool twists and turns.

Hanna's plan: "Who's buried in Ali's grave?" fans wonder about the question and so does Hanna. Her recent interest in crime novels helps her to come with a new plan to figure out whose body rests in Ali's grave.

Spencer the detective: Hanna is not the only one with detective hat on, Spencer is running her own investigation. She is working overtime to unlock the stories in Ali's diary. Spencer believes that the diary contains the true identity of Ali's mystery man. However, both Spencer and Hanna are investigating, can that lead them into some kind of "A"danger?

Andrew returns: Spencer's buddy Andrew is back, and she wants him to share his success mantra with her. She is not talking about notes, here.

Mike's new buddy: The synopsis teases that Aria is not happy with Mike's new friend. The Canadian promo of "Pretty Little Liars" season 4 episode 17 shows the friend is Mona. Does Mona love Mike?

Emily's dad concerned about her: Emily is freaking out in the promo, and it does hints that her dad is concerned about her daughter's behaviour.

Mona's back too: Andrew is not the only one coming back this week. Maggie is here to deal with some issues with her lease and ship boxes to Seattle. Ezra is upset to learn that Maggie decided to leave Malcolm in Seattle.

"So what are you saying, Maggie?" asks Ezra. "That I'm not going to have a connection to Malcolm unless it's through an attorney?"

The next episode of "Pretty Little Liars" season 4 airs Tuesday, Jan. 28, 2014 on ABC Family at 8 p.n. ET.