: The episode marks a transition from the girls reacting to "A" to them actively trying to "catch A at their own game".
The Season 1 finale, " For Whom the Bell Tolls " (S1E22), is a pivotal episode that originally aired on March 21, 2011. It is widely remembered for its high stakes, drawing 3.64 million viewers as one of the season's highest-rated installments. Key Plot Developments
Reviewers from Wikipedia and Rotten Tomatoes highlight the episode's successful use of suspense and "unlikely sources" for help.
: Learns her mother is determined to move the family to Texas.