McKay's account of his odyssey brings to life the story of the Church of Jesus Christ’s transformation into a global faith. Throughout his diary, McKay expressed his humanity, curiosity, and fascination with cultures and places--the Maori hongi, East Asian customs, Australian wildlife, and more. At the same time, he and his travel companion, Hugh J. Cannon, detailed the Latter-day Saint missionary life of the era, closely observing logistical challenges and cultural differences, guiding various church efforts, and listening to followers' impressions and concerns. Reid L. Neilson and Carson V. Teuscher's meticulous notes provide historical, religious, and general context for the reader.

Blending travelogue with history, Pacific Apostle illuminates the thought and work of an essential figure in the twentieth-century Church of Jesus Christ