The Mystery Code

Finn, Kristina, Kieran and Oscar are super smart and love working together to design gadgets and solve problems.
When their school teacher disappears in the quiet seaside town of Greystones, Finn and his friends start to investigate.
The kids find a cryptic message that they use their coding skills to crack. The decoded message is a rhyme, suggesting there is treasure nearby.
This leads them on a journey involving maps, pirates and a dramatic rescue.
Join Finn and his brilliant friends on yet another thrilling and fun-filled adventure. 

Review:
"The mystery code continues the story of Finn O’Shea, an Irish boy. I could hardly put this book down. It’s perfect for ages 5-11 or maybe older for readers who remember Finn from his previous adventures. This charming story keeps readers captivated with fascinating plots and high stakes. I would certainly recommend this book as well as the rest of the series." (Jenny, age 11)