Cast:
Tandy Angel: Kristen Stewart
Harry Angel: Nick Jonas
Hugo Angel: Jared Gilmore
Matthew Angel: Channing Tatum
Maud Angel: Angelina Jolie
Malcolm Angel: Robert Downey Jr.
Peter Angel: Wallace Shawn
Samantha Peck: Kelly Rutherford
Sergeant Caputo: Robbie Coltrane
Detective Hayes: Josh Dallas
Philippe Montaigne: Matthew Settle
Tamara Gee: Jenna Dewan
I think this cast fits the description the author gave pretty well. I did have some difficulties finding the perfect actor/actress for Samantha, Philippe, Tamara, and Detective Hayes because the author didn't describe the characters as vividly as the others.
Scenes:
The crime scene
The part where Tandy searches through Samantha's office
When they find out about Malcolm and Tamara
When they find out about Samantha and Maud
When they discover the secret lab
The part when Tandy accuses Peter
The funeral
When they find out about Tamara's death
When they find the cameras
When they see the video of their parent's death
When Hugo breaks into their neighbor's apartment
Tandy's flashbacks/confessions
When Harry performs
When Matthew makes the remark about his parents getting taken out with the trash
When Harry says his parents died thinking he was useless
Every time Tandy gets a new clue/lead
These are the scenes that I think should definitely be in the movie because these are the most important parts of the book.
Quotes:
Matthew: "My parents were just carried out of the building in the service elevator," he shouted at the cops. "They were vile, but they didn't deserve to be taken out with the trash!"
Caputo: "Sergeant Capricorn Caputo and Detective Ryan Hayes, NYPD. Please open the door."
Harry: "I'll tell you what's killing me, Tandy."
Tandy: "I'm listening"
Harry: "They never loved me."
Tandy: "Come on. They were different, that's all-"
Harry: "One day I was going to prove myself to them. I never had the chance to do it before they died. They died thinking I was useless."
I think this idea will work because people like seeing movies after they've read the book so if you make a movie people will want to read the book before they see the movie this will get more people to read this book. This will also keep readers connected because this book is the first of a series so if they read the first book they'll want to read the rest of the series and if the other books are also turned into movies this will also cause more people to want to read the books before the movies comes out such as the Hunger Games series or the Harry Potter series.

