Despite everything said and done so far, Charles continues to keep his family as well as the Liars enmeshed in his dirty games.

Christian Today reports that everyone concerned in 'Pretty Little Liars,' the popular teen drama mystery-thriller television series, are on high alert after Mr. DiLaurentis (Jim Abele) discovered a birthday card from Charles on the windshield of his car. According to the report, Charles, the supposedly dead brother of Alison (Sasha Pieterse) and Jason (Drew Van Acker) wrote in the card that he is returning home for his birthday and directed his fate that he ought to plan "a party to die for."

Apart from this sinister act, DiLaurentis' estranged son also hinted that only his father is invited to his birthday party. Hence, Mr. DiLaurentis is now keen to leave Rosewood along with his children prior to his eldest son's return.

The official synopsis for 'Pretty Little Liars' Season 6 episode 7 titled 'O Brother, Where Art Thou' reads, "There are mixed emotions in the DiLaurentis household when Charles declares he is coming home for his birthday. Mr. DiLaurentis wants to quickly get out of town to hide Ali and Jason from their brother, while Jason sees this as an opportunity to finally validate all of the early childhood memories he has of 'Charlie.'"

Meanwhile, the birthday card from Charles has not only unnerved DiLaurentis and his family, as they are unsure of what they need to do if Charles really returns to Rosewood. According to the synopsis, the Liars also have opposing views about Charles' return. While this will be an excellent opportunity for Hanna (Ashley Benson) and Spencer (Troian Bellisario) to put Charles behind bars for all the awful things he did to them in the past. On the other hand, Emily (Shay Mitchell) and Aria (Lucy Hale) are frightened to be anywhere close to him.

Now it remains to be seen whether Charles will really reveal himself in the upcoming episode, or he is just conspiring to keep the inhabitants of Rosewood at the edge of their seats.

The promo for 'O Brother, Where Art Thou' shows the return of "A's" black hoodie, and it may possibly cost Toby's (Keegan Allen) life.

'Pretty Little Liars' Season 6 episode 7 titled 'O Brother, Where Art Thou' airs on Tuesday, July 21, on ABC Family.