Ah, Mother Teresa. That ever-glowing saint from the gutters of Calcutta who apparently served India by showcasing her poverty to the world—on a silver (well, probably gold-plated) Western platter. If you’ve grown up hearing her name invoked in every moral sermon and school essay about “compassion,” you’ll understand the delicious satisfaction of reading Aroup Chatterjee’s The Untold Story. Finally, someone opens the curtains on the sanctified show—and what we find behind it isn’t quite divine. Dr. Chatterjee, a physician from Kolkata, offers not a book, but a scalpel. He cuts clean through the decades of media adulation and exposes something that every thinking Indian ought to have suspected: that the “Saint…