When four criminals steal a vault from a bank, Tony Toretto and his crew have to jump into action . . . and fast! The stolen vault isn't full of money or gold like the thieves originally thought. Instead, the vault is holding a one-of-a-kind, highly sensitive, miniaturized transflux particle accelerator. An accelerator that can't be driven over forty miles per hour or it might explode! Follow along as Tony, Echo, Layla, Frostee, and Cisco race against time through the San Francisco Bay tunnels to catch the criminals and save the city in this exciting brand-new fiction chapter book filled with two-color illustrations.