SPOILERS for Survive the Night by Riley Sager

 

If you continue reading, you will be exposed to spoilers about the above book. Proceed with caution.

Robbie was the killer who killed Maddie and the other girls. The Campus Killer.

Marge was Maddie's grandma. She hired Josh to bring Charlie to her. She wanted to force Charlie to tell her what she saw before she died of cancer.

What surprised me was that the book was actually a movie about what had happened. With some liberties, but as the reader, I thought it was a movie in Charlie's mind, but no. It was the actual playing of the movie's premier.