Book 3

The Code Busters Club, Case 3

by Penny Warner

Published 1 January 2013
When the Code Busters visit the Carmel Mission, a series of coded messages sets them on the hunt for long-hidden pirate treasure.

Book 7


Book 8

The Science Fair Scheme

by Penny Warner

Published 1 January 2024

Book 9


Book 10


The Secret of the Puzzle Box

by Penny Warner

Published 1 August 2016
"The members of the Code Busters Club take a class trip to Angel Island--the Ellis Island of the West--where they discover a mysterious box with a connection to one of the Code Busters"--

The Mummy's Curse

by Penny Warner

Published 1 January 2014

"An enigmatic message leads the Code Busters on a treasure hunt on creepy Alcatraz Island, where they must use their problem-solving skills to unravel the mystery"--




The Haunted Lighthouse

by Penny Warner

Published 1 August 2012

The Mummy's Curse

by Penny Warner

Published 1 January 2016

The Hunt for the Missing Spy

by Penny Warner

Published 1 January 2016
During a class trip to Washington, D.C., the Code Busters have many opportunities to hone their sleuthing skills as they explore the International Spy Museum, the White House, and more, but when a classmate goes missing, a mysterious figure in a trench coat may be the key to solving the case.