Using their code-breaking skills, four seventh-graders solve the mystery of the eccentric man who draws stick figures on his second-floor bedroom window.

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

"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 over one hundred rooms, doors that lead to nowhere, and possible ghosts. But when the Code Busters search for a girl who’s lost in the mansion, they must avoid getting caught! Will the Code Busters be able to find the girl and avoid getting caught by the supposed security guard? Can you crack the...

"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 Code Busters are competing in their school's science fair, but when a mysterious drone ruins their project, it is up to sixth grader Cody and her friends to figure out who is responsible. Back matter includes keys to the codes and solutions to the coded messages that appear throughout the text.