“Black widow” is the name given to the poisonous karakurt spider in many countries. His life is surrounded by an aura of secrets and mysteries. The author, a biologist and naturalist writer, deeply studied the life of this peculiar desert inhabitant and found a new simple way to treat his bite. In an entertaining essay form, it tells about other spiders and arachnids living on the territory of Kazakhstan, including those first discovered and described by the author. The book is addressed to the general reader.