Drawing on a decade of ethnographic research in the Indian city of Mumbai, is an unconventional little book – experimental in form – about how we come to know the worlds about which we write. The narrative follows the author’s fieldnotes diaries as they wend their way through a series of ethnographic puzzles that emerge in the wake of a high-profile mega-infrastructure project that became an internationally celebrated prototype and model. complicates this celebratory narrative by revealing the conflicting temporalities and procedural pretentions of ‘world class’ developmentalism. On one level, is a book about Mumbai – about housing schemes and scams, about ‘duplicate’ documents (and ‘duplicate duplicates’), and about the material wreckage wrought by the city’s ‘world-class’ ambitions. And at the same time, it has a larger story to tell about truth and falsehood, time and memory – and about the promises and pitfalls of knowledge production, interpretation and representation more generally.