From Book to Screen: The Mortal Instruments

We all know that young adult novels have flourished in becoming major motion pictures. Divergent, by Veronica Roth, Hunger Games, by Suzanne Collins, The Fault In Our Stars, by John Green, the list goes on and on. But the transformation I'm most excited about is my favorite book, The Mortal Instruments: City Of Bones, by Cassandra Clare, becoming not a movie but a TV show.
The book is about a 15-year-old names Clary, who has her life turned upside down by coming across the hidden world of shadow hunters and demons. The book begins with her and her best friend, Simon, out clubbing in downtown New York. They are at the club Pandemonium and she sees a beautiful girl follow a guy, who was in line in front of Clary at the club's entrance, into a storage closet. She next watches two other guys follow the girl into the closet. After following them into the closet, she sees them pull out knives, torture the guy, and accuse him of being a demon.
She goes to tell her best friend Simon about it but upon trying to point them out to him, she realizes only she can see them. After that odd event, the next day she is at a coffee shop with Simon. Her mom keeps calling her frantically. Ignoring the phone, Clary sees one of the guys who tortured the demon at Pandemonium. He introduces himself as Jace, and tells her to come with him. After more calls, finally picking up the phone, Clary's mom rushes to tell her not to come home and how much she loves her, then the line cuts off. Clary rushes home to find her mom gone and in place a demon creature which ends up biting and poisoning her. Jace ends up taking her back to the Institute, where shadow hunters live, train, and the like.
The book obviously goes into more detail and goes far beyond the plot I just gave you but I don't expect the TV show to go along with plot of the book like I'd hope. The movie made based on the book was overall a good movie, but can't be compared to the book. When a book is released as becoming a movie I normally get my hopes up that the movie will go along with book's plot. As you can expect that is never the case. I expect nothing less for the TV show.
I'm trying very hard to not be let down if the plot is completely different. The TV show is BASED off of the book, meaning it's a loose interpretation of the novel. I think the cast for the TV show, called Shadowhunters, has good actor choices but come that confuse me deeply. For example, Kat McNamara, playing Clary is a good choice. But Isaiah Mustafa, playing Luke Garroway, who is the boyfriend of Clary's mom, isn't a good match in my eyes. I bet he'll be a great actor but I never pictured Luke looking like Isaiah.
I can say, while Shadowhunters may not follow the plot of City of Bones and not have all of my dream actors portraying the character, I always get super excited over and over again because their behind the scenes pictures on Instagram show the cast having a great time filming. Hope you guys are as excited as I am for Shadowhunters to come out and will watch it along with me!