<P> Clarissa "Clary" Adele Fray / Fairchild / Morgenstern is a fictional character and the main protagonist of the Mortal Instruments series . While at a New York City nightclub, the Pandemonium, she is stunned to observe a group of teenagers with apparent supernatural abilities: Jace, Isabelle, and Alec . She sees them attack a demon and soon realizes she is the only person able to see them . </P> <P> After the battle, Clary is introduced to the group of teens, who identify themselves as Shadowhunters, a race of humans who are physically enhanced with angel blood, who secretly protect humanity from demons . When her mother Jocelyn goes missing, Clary learns that the event is connected to the conflict between the Shadowhunters and their enemies . She then enters the Shadowhunter fold, using her newly revealed mystical abilities to assist the group while attempting to find her mother . In the process, she falls in love with fellow Shadowhunter Jace / Jonathan Herondale . </P> <P> Clary learns that Valentine Morgenstern, the main antagonist of the series, is her biological father and her mother's ex-husband . At the end of City of Bones, Valentine tells them that Clary and Jace are siblings--which, they discover later in the series, is a lie . In the second book of the series, City of Ashes, Clary dates her best friend Simon, who has for a long time had a crush on her, in order to forget Jace during the torturous time of believing him to be her brother . She is told by the Seelie Queen that she has the ability to create runes that don't exist; but they do exist, which later enables her to destroy Valentine's ship using the "Open" rune . In the end of the second novel, Clary finds that an old friend of her mother, Madeleine, knows how to wake her mother, who has been in a magical coma since the first book . </P> <P> In City of Glass, it is discovered that Jocelyn had taken a potion, made by a warlock named Ragnor Fell, to induce a comatose state and prevent her from being interrogated by Valentine . Before she dies, Madeleine tells Clary she needs to find Fell, who will help her cure her mother . Clary uses a magic portal to convey herself and Luke to Idris, and falls into Lake Lyn and drinks some of the water by accident; this causes her to hallucinate and then to become lucid, because the lake's water is poisonous to Shadowhunters . Luke then takes her to his sister Amatis for healing . </P>

When do jace and clary find out they are siblings