It’s an eerie coincidence, two Malaysian Airlines flights going down within a span of five months. MH370, the plane that vanished without a trace, may never be found, while investigations into last week’s shooting down of the second one, MH17, are still on. Incredibly, a book, Flight MH370: The Mystery, is out already about the March incident. Nabanita Sircar spoke to its author, Nigel Cawthorne, at the British Library in London. Excerpts: