Fans of Sara Pennypacker and Katherine Applegate will love this thrilling environmental fable—filled with laughter, music, and adventure. There's no other place Tubs Marshfield would rather be than singing a song in his perfect little swamp along the Louisiana bayou. His music can make anyone feel happy. But something terrible is happening within the swamp that even Tubs' songs can't fix—and it's making his neighbors feel sick! No one knows...