<P> Aria also reveals her relationship with Ezra to her parents before "- A" can, which ends negatively . Aria's father makes numerous threats towards him, before causing him to lose his job at Hollis College . Although they break up briefly, Aria and Ezra begin seeing each other in secret with the help of her childhood friend, Holden Strauss . Unbeknownst to his overprotective parents, Holden participates in regular fighting competitions, despite having a severe heart condition . </P> <P> The girls later attempt to trick "- A" by making them think they have something that could give away their identity; Emily is confronted by "- A" in an abandoned plan nursery . When Emily reveals the girls had tricked them, "- A" physically attacks her, but Aria and Spencer arrive and corner them . They throw a vase into the air, shattering the glass ceiling and allowing them enough time to escape; however, Hanna arrives and hits "- A" with her car, knocking them down momentarily . The girls chase them into the woods, but lose them . They return to the nursery, where they discover "- A's" phone . The girls enlist Caleb's help in unlocking the phone, as Hanna and Caleb had gotten back together during the latter half of the season . </P> <P> Eventually, Alison is linked to an old doll hospital in town nearby called Brookhaven, and later a rural motel, The Lost Woods Resort . The girls attend a masquerade party, where they plan to confront "- A" who appears to be a woman dressed as The Black Swan from Swan Lake . Spencer, accompanied by Mona, rides out to Lost Woods, while the other girls chase "- A". Spencer and Mona are able to steal the key to one of the rooms, which is revealed to be "- A's" Lair . Mona then reveals to Spencer that she is "- A", while the woman at the costume party was only a decoy . Mona knocks Spencer unconscious, driving her to a nearby cliff . She gives Spencer the option of joining her "- A" Team, or dying . </P> <P> Spencer momentarily escapes, and the other girls learn of Mona's plan and rush to her aid . Spencer and Mona struggle, and Mona is knocked into a ravine, but survives . Emily learns that Maya was murdered, after she had seemingly disappeared . Mona is hospitalized in Radley Sanitarium, where she is visited by a blonde woman in a red trench coat, revealing Mona was working for someone else the whole time . </P>

Who is a in season 2 of pll