Brief synopsis (no spoilers): Emily and James participate in the latest challenge from Garrison Griswold, "unlock the rock," a large scale escape room game on Alcatraz Island. Category: Juv Why I chose this book: Third in a series My personal opinion: This one was pretty fun. It does have a few creepy elements, especially for beings stationed on an abandoned prison, but overall it was fun. I like how the puzzles are incorporated into the book. Warnings Language: None Violence: None (one character does get trapped by someone) "Adult" situations: None Death: None Movie rating equivalent: PG (but there are some scary/creepy elements, e.g. dark places, someone getting trapped, inmate actors at the prison) Protagonist description: Emily and James are great puzzle solvers and are eager to participate in this latest challenge. Matthew - Emily's older brother who also wants to take part in the puzzle solving action. He gets blamed f...