Code Busters Club Books in Order

Cody, Quinn, Luke, and M.E. spot a coded message in their neighbor's window and realize it is a cry for help. When the old man disappears and his house burns, the Code Busters race to solve the mystery and uncover hidden treasure.

A class trip to Alcatraz turns into a real treasure hunt when the Code Busters find a clue linked to a jewel thief's hidden stash. To crack the case, they will need to outsmart the island's secrets and solve a trail of codes.

On a class trip, the Code Busters uncover clues tied to the pirate Hippolyte Bouchard and a lost cache of treasure. A coded journal and map send them chasing history, danger, and a prize someone else wants first.

A school visit to an Egyptian museum turns serious when a theft and a coded message point to something crooked. The Code Busters must use their puzzle skills, and what they learn about hieroglyphs, before the culprit turns the blame on them.

A trip to Washington, D.C. and the International Spy Museum should be a dream for the Code Busters. Instead, strange messages, a shadowy follower, and a missing classmate drop them into a mystery worthy of a real spy novel.

At Angel Island, Mika hopes to learn more about her family's past and a possible clue left by an ancestor. What starts with a puzzle box and hidden messages opens into a deeper mystery that links history to danger.

A day at a Houdini-inspired theme park turns urgent when Cody's younger sister disappears and a masked stranger starts shadowing the Code Busters. The prize hunt suddenly becomes a race to find a missing child.

Matt the Brat forms a rival club, and a school scavenger hunt turns into a showdown over who is best at codes. Then the teachers begin disappearing, and the competition becomes a real mystery.

Luke's birthday trip to the Winchester Mystery House should be all twists and ghost stories. Instead, the Code Busters end up searching for a lost girl while dodging a suspicious security guard in a very confusing mansion.

The Code Busters expect fierce competition at the school science fair, especially from Matt the Brat. When their projects are sabotaged by a mysterious drone, they have a new puzzle to crack before the fair is ruined.

A trip to Gold Country brings the Code Busters face to face with rumors of hidden gold and Bigfoot. What sounds like campfire nonsense starts to look like a conspiracy they may have to outrun.

When the school mascot and other items vanish, the Code Busters jump into the case. With blame landing in the wrong place, they have to work with unlikely allies to find the thief and the reason behind the damage.