Little Bill clutches his backpack tightly, his eyes wide with fear as the ghostly shape floats closer. Andrew and Kiku huddle behind him, mouths agape, while Fuchsia points toward the apparition. "Did you see that? It moved!" "Let’s get out of here! Run!"

Kiku glances over her shoulder, her breath coming in panicked bursts, while Fuchsia nearly trips on the curb in her hurry. Little Bill leads the way, heart thudding in his chest. "What if it follows us home?" "We need help! Let’s tell Geo Umizoomi!"

Little Bill[/@ch_1]'s living room, the bright overhead lights and cheerful wallpaper a stark contrast to their terror. Geo Umizoomi stands near a table covered in colorful math tools and gadgets.] Little Bill tries to catch his breath as he describes the ghost, hands waving wildly. Geo Umizoomi listens intently, brow furrowed with concern. "Geo, we saw a ghost at the playground! It was floating and glowing and... and it chased us!" "Don’t worry, friends. Let’s work together and solve this mystery as a team."

Geo Umizoomi[/@ch_5], Little Bill, and the friends creep quietly among the shadows, flashlights illuminating the grass and sand.] The group moves cautiously, shining their lights behind slides and under benches. The faint shimmer appears again, this time near the big oak tree. Andrew grips Geo Umizoomi's sleeve. "There it is! Geo, do you see it?" "Yes, but look closely—something seems odd about that ghost..."

Bobby[/@ch_6], clutching a flashlight and giggling.] Bobby, the playful older brother, had set up the prank to scare his friends for fun. Little Bill gasps in surprise, the tension melting into relief as everyone realizes the truth. "Bobby! That was you all along?" "Sorry, guys! I just wanted to see if I could give you a little Halloween scare."

Geo Umizoomi[/@ch_5], who reassures them with a warm smile.] Geo Umizoomi leads the group in a friendly handshake, reminding them of the power of teamwork and facing fears together. Kiku grins, while Fuchsia hugs Little Bill. "Whenever something seems scary, it’s always good to take a closer look and ask for help. Great job, team!" "Thanks, Geo! Next time, we’ll solve the mystery before we run away."