The book, a sensitively written account of Delhi's "grand theatre of the past and present", is sure to make many nostalgic about "the composite identity of India" that got lost in 1947.
"Since I come from the so-called 'enemy country' I had to double, triple check facts and had to be as careful as possible," he said, at the book release function which was chaired by renowned academic Prof Mushirul Hasan.
"All the terrorists are reading my book," he chuckled at the well-attended book launch.
Prof Hasan did not make it any easy for Rumi. "Is the two-nation theory wrong?"; "Why are Sufi shrines being bombed in Pakistan?"; "Why are Shias being killed in your country?"; "Is it time for an interfaith dialogue?"
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Rumi dodged such loaded questions with what could have otherwise passed off as humour, but was unfortunately a sad commentary on his country.
"Mushir Sahab you are forgetting that I have to go back to Pakistan. I have no intention of seeking asylum here...." he said, as everyone laughed.
"The book is my own discovery of the Other. Pakistani and Indian cultures are so interlinked, especially in northern India, that the idea of a nation state seems lost," says Rumi.
"In view of 1000 years of deeply intertwined history, 65 years of history of separation mean nothing," he said.
In a lighter vein Rumi said he found the similarities between the "babus" of the two countries and also South Asia "spooky".