"In his apartment building in the city, Sam hears all kinds of noises coming from behind closed doors--voices, a dog barking, a loud TV, snoring even crunching potato chips. But one rainy day he hears the sad sounds of a harmonica."

Sam and his little brother, Ben, set out to find out more about who is playing the harmonica. Looking for opportunities for new experiences and new friendships as well as noticing the connection between music and emotion are themes of this adventure for these two brothers.