In late December last year, a secret letter went from New Delhi to Dhaka. It was delivered directly to Sheikh Hasina, 65, the prime minister of Bangladesh. It warned her that Islamist radicals embedded within the Bangladesh Army were planning a coup. Hasina had reason to fear coups. On the night of August 15, 1975, her father, Bangladesh's first president Sheikh Mujibur Rahman, her mother and three brothers were massacred by officers of the Bangladesh Army. Hasina and her sister would have been dead as well, but were abroad on a tour of Europe.