Madeleine Cost is working to become the youngest person ever to win the Archibald Prize for portraiture. Her elusive cousin Tyler is the perfect subject: androgynous, beautiful, and famous. All she needs to do is pin him down for the sittings. None of her plans factored in the Spires: featureless, impossible, spearing into the hearts of cities across the world – and spraying clouds of sparkling dust into the wind. Is it an alien invasion? Germ warfare? They are questions everyone on Earth would like answered, but Madeleine has a more immediate problem. At Ground Zero of the Sydney Spire, beneath the collapsed ruin of St James Station, she must make it to the surface before she can hope to find out if the world is ending