The Key with No Lock

Leo is a student. His grandmother gives him a small, old box. Inside is a strange key and a note. The note says only two words: "Kew. Find it."

Leo goes to Kew Gardens. It is very big. He walks and looks for a long time. Then, he sees a small, old greenhouse. It is forgotten.

He puts the key in the door. The key turns!

Inside, the room is very dusty. But on a table, there is one small, clean box. Leo is surprised. He walks to the table and puts his hand out.

Then, he hears a noise. Footsteps. Someone is outside the door.