When the streetlights flicker and the lampposts blink blue, the old songs begin to whisper again. Blackbird Pie IV continues R. J. Kellan's cycle of nursery rhyme noir - twelve haunting, luminous reimaginings of classic rhymes as dark civic parables. "Girls and Boys Come Out to Play" becomes an algorithmic curfew. "Hot Cross Buns" hides a blessing in burnt sugar. "Jack Sprat" and "Old Mother Hubbard" count hunger in data, not bread. "Pat-a-Cake" prints evidence, not pastry. "One, Two, Three, Four, Five" counts a debt the ocean refuses to forget. Each story stands alone yet hums with the others - tales of conscience, system design, and fragile hope in a world still learning how to count what matters. Together they form a ledger of nights and a record of hands at work - the quiet, defiant kind that keep the lights on when systems fail. Elegant, unsettling, and deeply humane, Blackbird Pie IV is both an echo and a revelation: the moment when rhyme becomes reckoning, and every line you thought was innocent turns out to have been a code. The lights dim. The rhyme begins again.