Meanwhile , Mona later returns to Rosewood , heavily questioned by the police about her actions while her friendship with Lesli is strained because of her involvement with Mona 's actions .
Alison , Jason , Hanna , and Spencer later discover Charles ' grave in her backyard .
Mona later returns to Rosewood , heavily questioned by the police about her actions while her friendship with Lesli is strained because of her involvement with Mona 's actions .
Alison , Jason , Hanna , and Spencer later discover Charles ' grave in her backyard .