Final answer:
Mr. Griswold in 'Book Scavenger' was mugged at a BART station in San Francisco, initiating the mystery central to the plot.
Step-by-step explanation:
San Francisco, For twelve-year-old Emily, the best thing about moving to San Francisco is that it's the home city of her literary idol: Garrison Griswold, book publisher and creator of the online sensation Book Scavenger. From 2015-2022 readers around the world hid and found thousands of books as part of a real-life Book Scavenger game. Bertram's novel follows twelve-year-old Emily, new to San Francisco, as she follows clues in a mysterious book that might just be the new Book Scavenger game designed by her hero, Garrison Griswold.
The story is of a young girl named Emily whose family is on a constant, self-imposed mission which forces them to move every year or so, making it difficult and essentially pointless for her to put any effort into making friends; they move to San Francisco just as her hero, Garrison Griswold.
In the book Book Scavenger, Mr. Griswold was mugged at a BART station in San Francisco, which sets off a mystery involving codes, puzzles, and a treasure hunt through books. The mugging is a key event that propels the protagonists, Emily and James, into their quest to solve the mystery of Mr. Griswold's new game and the attack on him.