In 1969, several young men met on a rainy night in Kabul to form an Islamist student group. Their aim was laid out in a simple typewritten statement: to halt the spread of Soviet and American influence in Afghanistan. They went on to change the world. Night Letters tells the extraordinary story of the group's most notorious member, Gulbuddin Hekmatyar, and the guerrilla organzation he came to lead, Hizb-e Islami. By the late 1980s, tens of...