When farm boy Homer Pudding's explorer-uncle dies and leaves him a droopy dog with a mysterious coin hidden on its collar, it leads him to The City, where they meet Madame La Directeur, the conniving head of the Natural History Museum, who is trying to steal the coin and take Homer's place in a secret society of adventurers.

Codename Kathmandu, better known as Kat, loves logic and order, has a favorite eight-digit number, and can spot a pattern from a mile away. So when a series of cyberattacks hits key locations in London while the spies are testing security for the British Museum, it's clear that Kat's skill for finding reason in what seems like randomness makes her the perfect candidate to lead the job. And while the team follows the deciphered messages to Egypt and...

Where are Amy and Dan Cahill? The two kids were last seen in Egypt, hunting for one of the 39 Clues that could make them the most powerful people on earth. But no one has seen the siblings since. Has the ruthless Irina Spasky finally tracked them down? Or worse ... the Madrigals?

Fourteen-year-old Bobby Pendragon, having learned he is a Traveler--someone who can ride "flumes" through time and space, is soon off to the alternative dimension of Denduron where he teams up with Loor, a girl his age from the warrior-territory of Zadaa, in an attempt to save the gentle Milago people from slavery.

"Link, Michael, and Dana live in a quiet town. But it's woken up very quickly when someone sneaks into school and vandalizes it with a swastika. Nobody can believe it. How could such a symbol of hate end up in the middle of their school? Who would do such a thing? Because Michael was the first person to see it, he's the first suspect. Because Link is one of the most popular guys in school, everyone's looking to him to figure it out. And because Dana's...

"After taking down a mole within their organization, the City Spies are ready for their next mission--once again using their unique skills and ability to infiltrate places adults can't. The sinister Umbra has their sights set on recruiting a North Korean nuclear physicist by any means necessary, and the City Spies plan to keep an eye on his son by sending Paris to the chess prodigy's tournaments in Moscow and Beijing. Meanwhile, Sydney's embedded...

Jake, Amber, and Wes encounter new dangers and find their friendship tested as they follow the clues Jake's grandfather hid away in the old scrapbook. The stakes are higher, and the history goes deeper as the three kids put their heads together to solve a puzzle that is perhaps hundreds of years in the making.