The Priceless Pearl

From Bahaikipedia

The Priceless Pearl is a book published in 1969. The book talks of the life of Shoghi Effendi, His early life, His work towards the faith, and towards the later part of His life. The book was written by his wife Amatu'l-Bahá Rúhíyyih Khanum. It also has some personal stories in it, such as the marriage between The Guardian and Rúḥíyyih Khánum, and His close connection to Abdu'l-Bahá and Bahíyyih Khánum, The Greatest Holy Leaf.