Call to the Nations is a collection of extracts from a fascinating series of letters penned by Shoghi Effendi to the Baha'is of the world. His insightful letters offer a glimpse of the scope of the Faith and provide context for its ultimate mission the unification of mankind. For thirty-six years (1921-1957), from the age of twenty-four, Shoghi Effendi served as the head of the Baha'i Faith, directing the affairs of its worldwide community and giving practical expression to its ideals. His insightful letters offer a glimpse of the scope of the Baha'i Faith and provide context for its ultimate mission of the unification of mankind.