Continues the adventures of four tech-savvy kids, Adam, Finn, Lewis, and Emily, as they dig deeper into the world of online crime in a high-tech, high-stakes game of cat and mouse with Shantorian, the world's most dangerous hacker. Includes a URL and passwords for a related website where readers can decipher plot-related puzzles and watch videos that further develop the story.

"Read the book, watch the videos, break the codes"--Slipcover.