<Tr> <Td_colspan="2"> ← Previous Season 3 Next → Season 5 </Td> </Tr> <Tr> <Td_colspan="2"> List of Pretty Little Liars episodes </Td> </Tr> <P> The fourth season of the American mystery drama television series Pretty Little Liars began airing on ABC Family on June 11, 2013 . The season consisted of 24 episodes, which were filmed between March 14, 2013 and November 2, 2013 . The season concluded its broadcast on March 18, 2014 . </P> <P> The season continues from where it left off in the third - season finale, where the girls were rescued from the burning building by who they believe is Alison . 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 . It introduces new characters to the story, including Detective Gabriel Holbrook and Lieutenant Linda Tanner, played by Sean Faris and Roma Maffia, who are brought in to investigate the deaths of Detective Wilden and Detective Reynolds . Ella Montgomery (Holly Marie Combs) and Byron Montgomery (Chad Lowe) left the main cast . </P>

How many episodes season 4 pretty little liars