In the Washington, D.C., neighborhood of Capitol Hill, Lucy Rose's friend Adam "Melonhead" Melon, a budding inventor with a knack for getting into trouble, enters a science contest that challenges students to recycle an older invention into a new invention.

Ten-year-old Zoe Elias, who longs to play the piano but must resign herself to learning the organ, instead, finds that her musicianship has a positive impact on her workaholic mother, her jittery father, and her school social life.

When twelve-year-old Steve Brixton, a fan of Bailey Brothers detective novels, is mistaken for a real detective, he must elude librarians, police, and the mysterious Mr. E as he seeks a missing quilt containing coded information.