The Medusa Plot: Book 1
Gordon Korman
The Cahills aren’t the only family searching for the Clues… The Clue hunt is over, but Amy and Dan’s lives haven’t returned to normal. They now find themselves in a new global race, but this time they’re against a mysterious organization known as the Vespers. When a number of Cahills are kidnapped, Amy and Dan must rescue them.
Reviews

I really liked the secret codes all over the book and the part where they stole the medusa painting but it was a false one so they had to go to another person and steal in from them.
Professor Trigger Fink 11.01.2022