Her mother had paid the warlock Magnus Bane to put a block in her head so she could not remember parts of the Shadow World even moments after she sees it.
Clary learns that Valentine Morgenstern, who is supposed to be long dead but truly is not, the main antagonist of the series, is her biological father and her mother's husband.
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.
He gives both Shadowhunters visions of Valentine experimenting on his children with the demon and his angel blood in an attempt to make a stronger warrior.
They return to Alicante to see it burning from the first assault on the city, and after things are in order, Clary meets with the others and they go to free Simon who was taken to a Conclave prison called The Guard.
There, she learns her brother Jonathan Christopher Morgenstern/Sebastian Verlac is going to be raised from the dead by Simon, who is blackmailed by Lilith for the life of Clary, and she was brought just to make him do that.
Before the Clave can make a decision Clary, Jace, Simon, Isabelle and Alec sneak off to Edom, the demon realm Sebastian is hiding in; he has Jocelyn, Luke, Magnus and Raphael prisoner.
The group manage to escape after Simon gives up his immortality and memories of the Shadow World to Magnus Banes's father, Asmodeus.
Like all other Shadowhunters, he is covered in thin, pale scars from years of applying various magical runes with a stele for battle and healing purposes.
His mother, Elaine Lewis, becomes a more prominent character in City of Fallen Angels when she discovers that Simon is a vampire and kicks him out of the house.
Later, in City of Ashes, he begins to feel some side effects as a result of biting Raphael, the temporary head vampire while he was a rat.
The large quantity of Angel blood in Jace's body then allows Simon to stand in high sun with no risk of burning, unlike all other vampires who cannot.
In City of Lost Souls, Simon loses his Mark of Cain to the Angel Raziel in exchange for the sword "Glorious" to save Jace by separating him and Sebastian.
Throughout the book, Simon follows Clary and Jace—along with Isabelle and Alec—into the demon realm Edom to defeat Sebastian and find Magnus, Raphael, Luke and Jocelyn.
In the TV series, Alec is shown as having fluffy black hair, strong build, luminous hazel eyes, and an impressive height (6 ft 4in).
He regularly tampered with the mind of Clary Fray after designing a spell that would erase her memories of the Shadow World once every two years as a favour to her mother, Jocelyn.
He is an inch or two taller than Alec (although in the TV show Harry Shum Jr. is 5'11' while Matthew Daddario is 6'4') and is said to be lean, but not skinny, with lightly muscled arms.
In City of Ashes, Maia leaves Luke's apartment to apologize to Simon for her vicious reaction (after she was attacked) and realized he was a vampire.
She takes a potion, putting herself in a coma to protect her secrets and remains unconscious until she is revived by Magnus Bane in City of Glass.
Later in City of Lost Souls, after Luke is wounded by Sebastian and in critical condition, Jocelyn says to him how she regrets failing to have noticed his feelings for her back when they were younger and wishes he would have told her how he felt about her so she would have married "the right guy" instead of Valentine.
He becomes the main antagonist in City of Lost Souls, using Lilith's bond to alter Jace's memories to believe they are on the same side and plans on raising and army of demons and Dark Shadowhunters to destroy the world.
Before he manages to escape, Clary is forced to stab Jace with the angelic sword Glorious, severing his bond with Sebastian and causing the latter horrible pain.
At the end of the book he sends a message to Maryse Lightwood: severed angel wings with a single,piece of paper saying I am coming.
Sebastian offers to leave all of the Shadowhunters in Alicante alone, and return Jocelyn, Luke, Magnus, Raphael and Meliorn, whom he has kidnapped, if the Clave turn over Clary and Jace to him.
Her parents are both killed by Malcolm Fade — although it was unknown at the time — during the height of the war against Jonathan and his army of Endarkened Shadowhunters; though they are not the true suspects, the Clave decides to put the blame on them.
Maryse had a brother who decided to leave the Shadowhunter world in favor of marrying a mundane, making her an outcast in her peers, though she still honored him by naming her youngest son, Max, after him.
In City of Fallen Angels, Simon drinks her blood, but Camille turns her into a vampire and she starts working for Lilith after killing multiple mundanes.
Maureen, as leader of the clan, allowed the members to kill conspicuously while sending for some of them to capture Simon, who later escaped to Idris with Raphael.
Eventually Lily Chen, one of the second-in-commands of the clan, conspired with Maia Roberts, the new leader of the New York werewolf pack, to kill Maureen to stop her reckless actions; while most of the members were happy with her, some saw the error of her ways as a problem to their kind.
When he finds out that Jace is a descendant of Will, Zachariah becomes fiercely protective of him, especially when he is put under Jonathan Morgenstern's spell and infused with the heavenly fire.