Penny Warner 
Science Fair Scheme [PDF ebook] 

Will the Code Busters be able to unravel their latest case?Cody, Quinn, Luke, M.E., and Mika are the Code Busters-clever clue hunters with a passion for puzzles. They can’t wait to compete in the Science Fair. They each plan to come up with unique projects-all incorporating codes-for the chance to win first place! But when they discover someone spying on them and find pieces of their projects sabotaged, their chances of winning look slim. Will the Code Busters be able to find out who is spying on them? And can they salvage all their projects to win the prize?Can you crack the code? Test your brain with the Code Busters to see if you have the right stuff to be an ace detective. Answers are in the back, if you ever get stuck.