After Amit Shah took over as the party president in July 2014, an innocuous change instilled fear among the second- and third-rung Bharatiya Janata Party (BJP) leaders.
Until then, the BJP office at 11, Ashoka Road in New Delhi was disorganised and leaders were unpunctual. Meetings could last beyond midnight and next day the office would regain its buzz around late afternoon.
A month into Shah’s presidency, a BJP worker and occupant of one of the rooms noticed a nondescript young man, register in hand, visiting each of the 50-odd rooms on the premises and make small notes. It turned

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