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In page Shoghi Effendi:

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According to the framework of the Will and Testament of ʻAbdu'l-Bahá, it was not possible to appoint a successor, and the legislative body "possessing the exclusive right to legislate on matters not explicitly revealed" was not yet established in the world. Furthermore, Shoghi Effendi had left no will as attested to by the Hands of the Cause, who were required to ratify his selection.[4] All of the 27 living Hands of the Cause unanimously signed a statement shortly after the death of Shoghi Effendi stating that he had died "without having appointed his successor..." [5][6]