Mac Barnett is the author of the Brixton Brother series and several picture books, including Guess Again! and Chloe and the Lion (both illustrated by Adam Rex), and the New York Times bestseller Extra Yarn. He's on the board of directors of 826LA, a nonprofit writing center, and founded the Echo Park Time Travel Mart, a convenience store for time travelers. Mac lives in Oakland, California.

When a missing surfboard proves to have hidden depths, twelve-year-old super-sleuth Steve Brixton must go undercover?and underwater?to tackle a puzzling tangle of mysteries.
Steve Brixton's finally gotten a hang of this super-sleuth thing. After a few months of busting bad guys he finally has his own office?even if it's a bit small, and outside, and okay, used to be a doghouse.

So when someone asks him to help track down a board stolen by a local surf gang, it's just a matter of slipping into a neon wetsuit and blending in with the surfers?right?

But when the assignment goes all wrong, Steve is going to have to test his wits against pirate smugglers, thick-necked goons, and a sixth-grader who just wants his gym shorts back?all with the help of the tips and tricks he learned from his beloved Bailey Brothers books, of course!