Excerpt - The plane crash that killed President Muhammad Zia ul-Haq of Pakistan has spawned myriad conspiracy theories since his C-130 plunged into the Bahawalpur Desert with his top generals and the US Ambassador on board exactly 20 years ago tomorrow. The despot’s death changed Pakistan’s political landscape in an instant, ushering the Muslim state into a period of shaky civilian rule, similar to the situation the country finds itself in today. American, Soviet, Pakistani, Indian and even Israeli intelligence agents are among those blamed for sabotaging the plane. But now, two decades on, the The Times has reviewed the...