Peter, a curious six-year-old with wide blue eyes, stands on tiptoe to peer over the old wall. He clutches a small notebook, his "detective journal," and looks around to make sure no grown-ups are watching. "Today, I'll uncover the mysteries of the secret garden," he whispers to himself, pushing open the creaky gate.

Peter walks slowly, eyes searching for clues among the plants. He notices a patch of bright red tulips—exactly five in a row—and kneels beside them. "One, two, three, four, five," he counts softly, touching each flower with his finger. He grins and scribbles in his journal, "Clue: Five red tulips together make a line!"

A robin hops nearby, watching Peter with a curious tilt of her head. "Hello, little detective," Robin, the bird, chirrups as if she wants to join the adventure. "How many spots do you have on your back?" Peter asks, leaning close to a ladybug. He carefully counts, "One, two, three, four, five, six, seven," and draws a circle in his journal, writing, "Seven spots—lucky number!"

Peter sits on a stone and notices the lily pads. "They're round like circles!" he exclaims. He counts the lily pads, "One, two, three, four." He draws four big circles in his journal and writes, "Four circle lily pads—clue for the case!"

Peter traces the outline with his finger, connecting the heads of the tallest sunflowers. "One, two, three—it's a triangle!" he announces, excited. He draws the shape in his journal, labeling it "Triangle made of sunflowers."

Peter sits beneath a willow tree, feeling proud of the clues he's collected. He looks around at the secret world he’s discovered and smiles. "Learning math is the best mystery of all," he declares, already dreaming about tomorrow's adventures in the garden of numbers.