Description: "Secret Agent Leonard" is the first-ever mystery storybook series in Korea featuring Brown & Friends, the globally beloved character brand. Leonard, an original Brown & Friends character, transforms into a mystery detective to solve the curiosities of children around the world. From mysterious beings like zombies, Dracula, and the boogeyman to strange phenomena like the Bermuda Triangle and poltergeists, readers can uncover the truth behind mysteries everyone has wondered about at least once. As suspicious characters appear around mystery-solver Detective Leonard, new stories unfold one after another. These stories provide clues that lead into the next case, with unpredictable twists and turns that keep readers on the edge of their seats until the very end. Get ready for Detective Leonard's dazzling adventures as the secrets behind these mysterious cases are gradually revealed! [Story Summary] "Don't open it~ Don't open it~" One day, a mysterious song begins echoing from inside a closet. Detective Leonard receives a letter from Nancy, who lives in California, asking him to uncover the identity of the monster hiding in her closet. Leonard rushes to the scene to help the frightened Nancy. That night, he spots a mysterious shadow through the window... Will Detective Leonard be able to uncover the true identity of the boogeyman, the closet monster said to snatch away naughty children? Could a plane and a ship really vanish without a trace in the middle of the ocean? While investigating the mystery of the Bermuda Triangle, Detective Leonard is approached by a mysterious gentleman. The gentleman, who seems oddly interested in Bermuda, tells Leonard about a disappearance that occurred there. But in the blink of an eye, the gentleman vanishes without a trace, throwing Detective Leonard into confusion. To make matters worse, a suspicious figure begins approaching him... Will Detective Leonard be able to safely solve both the mystery and the danger closing in on him? The first-ever Brown & Friends children's storybook in Korea! Heart-pounding thrills and maximum suspense — Leonard's mysterious grand adventure! "Come in! Come in! K has been spotted!" While Detective Leonard is thrown into confusion by an offer from the Secret Agency, word comes in that a kappa — a water spirit — has appeared near the water's edge. Detective Leonard joins Agent Lulasong on an urgent mission. From interviewing a grandfather whose cucumber patch was mysteriously destroyed to diving into the lake for an underwater investigation, Detective Leonard works tirelessly to find traces of the kappa. Will Detective Leonard and Agent Lulasong be able to meet the mischievous kappa said to be hiding by the water? Detective Leonard receives a long-awaited call from William, who surprises him with news of a poltergeist camp being held in England. Just as he finishes the call and catches his breath, strange, unexplainable events begin happening at Leonard's detective office. Could this really be the poltergeist phenomenon he's only heard about? Meanwhile, Detective Leonard unexpectedly runs into Director Jessica, who once again asks him to become an agent for the Secret Agency. As Leonard hesitates, Director Jessica hands him a gift box locked with a secret code... Will Detective Leonard crack the code on the gift box holding the Secret Agency's secrets and finally accept the offer to become an agent? The first-ever Brown & Friends children's storybook in Korea — call for Leonard whenever chills run down your spine! "Secret Agent Leonard" is the first-ever mystery storybook series in Korea featuring Brown & Friends, the globally beloved character brand. Leonard, an original Brown & Friends character, transforms into a mystery detective to solve the curiosities of children around the world. From mysterious beings like the kappa, werewolves, and unicorns to strange phenomena like the Bermuda Triangle and poltergeists, readers can uncover the truth behind mysteries everyone has wondered about at least once. A mysterious organization called the Secret Agency appears before mystery-solver Leonard. The story that unfolds within the secret-filled Secret Agency...