Penny Warner

Readers will have tons of fun creating the codes right along with the characters in this interactive series. Cody, Quinn, Luke, and M.E. love playing around with codes. In fact, they love codes so much they have their own club, with a secret hideout and passwords that change every day. On a class trip to the Cornell Mission, the Code Busters learn about Hippolyte de Bouchard, California's only known pirate. Now the Code Busters are on the trail of...

Cody, Quinn, Luke, and M.E. are the Code Busters—clever clue hunters with a passion for puzzles. They can't wait for their school trip to Washington, D.C., where they'll get to visit the International Spy Museum. But it seems as if someone is spying on them—or at least leaving coded messages that even the Code Busters can't crack. And once they arrive at the museum, they notice they're being followed by a mysterious stranger. Then a classmate...

The Code Busters are excited for their class field trip to Angel Island, known as the Ellis Island of the West. One of Mika's ancestors passed through the island's immigration station in the early twentieth century, and Mika thinks he may have left behind some secret messages . . . plus a very special box. But as the Code Busters search for hints from the past, they get caught up in an even bigger secret. Can you crack the code? Test your brain with...

Cody, Quinn, Luke, M.E., and Mika are the Code Busters—clever clue hunters with a passion for puzzles. It's Luke's birthday and the group of friends are thrilled to be going to the Winchester Mystery House. They look forward to touring the mansion with ov