Adam Melon's friend Lucy Rose gave him a nickname--Melonhead--and it caught on fast. Melonhead is a self-proclaimed inventor. All his life, which is ten years and counting, great ideas have been popping in and out of his melon head. And sometimes they work! This year Melonhead's class is entering an inventing fair, so he and his friend Sam are dreaming up plans. And Capitol Hill has a ton of places to find invention parts. But they have to be sure they find what they need and get home on time with no excuses. That might be hard, because Melonhead and Sam have a way of forgetting. But their work will all pay off if they win first place--they'll be headed to even bigger and better things!