A mysterious sound. A hidden secret. Another unforgettable adventure!

When a strange note leads the Secret Neighborhood Club to the playground after dark, they expect another simple mystery.

But what they find is far more puzzling.

Tap... scrape... tap...

A strange noise echoes through the empty playground-moving, changing, and impossible to see. Is something hiding beneath the ground? Or is there a secret waiting to be discovered?

Leo, Mia, Noah, Sophie, and Ethan are ready to find out.

As they investigate, they uncover patterns, hidden clues, and a surprising truth that changes everything they thought they knew. Perfect for kids ages 6-9 who love: Spooky (but not scary) mystery adventuresFun detective stories with teamworkEarly chapter books with exciting twistsStories about curiosity, problem-solving, and friendship In this book, young readers will learn: Not everything mysterious is meant to be scaryHow to think logically and solve problems step by stepThe power of teamwork and creative thinking Can the Secret Neighborhood Club uncover the truth behind the strange noise?

Join the adventure and discover the secret hidden beneath the playground!

Book 3 in The Secret Neighborhood Club series