London's street musicians have been singing about the child Valkyrie for years: a girl who carries a broom-spear, takes in abandoned children, and corrects the wrongs she finds in the winding streets. The songs are popular. The enemy she has declared herself against is not: Mister Songbird, the one who whistles in the night, is genuinely dangerous. A Fallen London story about a girl who fights above her apparent weight class and the cost of choosing the wrong enemy.