First Grain of Sand is the story of a valiant Ahmadi missionary, Maulawi Zahoor Hussain, written in Urdu as his own memoir of the ordeal he suffered through. With a meagre amount of means and no protection outside of his Lord, he was the first Ahmadi Muslim missionary to venture into the Soviet Union. As harsh as the terrain and temperatures ran, so did the suspicions of espionage; for, the Russians and British harboured deep political differences with each other. Maulawi Zahoor Hussain, coming from British India, easily fell prey to such suspicions. Seized and taken into the custody of the Russian prison system, he was constantly interrogated, tortured, and harassed. Nevertheless, his faith endured and remained as firm as ever. In fact, it helped him persevere all the more. His entire ordeal is an eye-opening account of the truth of the Promised Messiah, peace be on him, and the miraculous power of prayer.