While on a mission aboard the The Emperor of the Seas, Ben Ripley faces off against his arch enemy, Murray Hill, on the high seas and quickly finds himself in hot water as things take a dangerous turn.

After getting expelled from spy school for accidentally shooting a live mortar into the principal's office, thirteen-year-old Ben finds himself recruited by evil crime organization SPYDER.

With SPYDER apparently defeated, thirteen-year-old Benjamin Ripley is hoping for some peace at spy school, but when the CIA conference room next to where Ben and Alexander are trying to explain everything to Ben's parents (no easy task) is blown up, suspicion falls on fellow trainee (and secret crush) Erica.

"Superspy middle schooler Ben Ripley is finally going to take SPYDER down, once and for all, in this latest addition to the New York Times bestselling Spy School series. Stranded in Mexico after nearly capturing the leaders of SPYDER, thirteen-year-old Ben Ripley desperately needs to take a shower. But even more so, he and his spy school friends need to come up with a new plan to defeat their enemies, their only clue a key that opens...something....