Once upon a time, there were four friends named Lily, Max, Ava, and Ben. They were all in the 0th grade and loved to explore their neighborhood. One day, while they were playing hide-and-seek, they stumbled upon a mysterious creature hiding in the bushes. It was big, green, and had sharp teeth. The friends were scared at first, but then they realized that the creature was just as scared as they were.

They decided to call it "Monster" and bring it back to their clubhouse. As they were walking, they noticed that Monster had a limp and was struggling to walk. They knew they had to help it. They asked their teacher, Mrs. Smith, for help. She told them that Monster was a rare species and needed special care. She also said that it was important to find out where Monster came from and why it was in their neighborhood.

The friends were determined to solve the mystery. They searched the library for books about rare creatures and asked their parents for help. They even made posters and put them up around the neighborhood, asking if anyone had seen Monster before. After days of searching, they finally found a clue. One of their neighbors, Mr. Jenkins, had seen Monster before. He told them that Monster was from a faraway land and had accidentally ended up in their neighborhood.

The friends were excited to have solved the mystery, but they knew they had to protect Monster from harm. They built a special shelter for it in their clubhouse and made sure it had everything it needed. They also made a plan to keep Monster's existence a secret, so that no one would try to harm it.

From that day on, Monster became a part of their group. They went on many adventures together and learned a lot from each other. The friends were proud of themselves for being brave and kind, and for solving the mystery of the hidden monster in their neighborhood. And Monster was grateful to have found a new home with such caring friends. The end.