Grace Woodbridge Roys suffered from bi-polar disease before it was well understood. Her daughter feared that her children would also suffer mental illness. This annotation of Grace’s diary opens the early 1900s missionary world in China and the personality of Grace to the reader. In December 1910 Grace married Harvey Curtis Roys, who was teaching physics at Kiang Nan government school in Nanking, under the sponsorship of the YMCA. Grace had had a mental breakdown weeks earlier when her missionary father forbade the marriage. The diary records their early married life, the births of their first two children, their social life with other missionaries in China, many of whom made major contributions to Nanking life and education: medical doctors and nurses, theology professors, agricultural innovators, and founders of universities, hospitals, nursing schools, and schools for young Chinese women and men. Included is their experience evacuating during the Sun Yat-sen Revolution of 1911. Well-known missionaries of that time came to tea and taught at the Hillcrest School that the mothers began for foreign children. The Nanyang Exposition took place in 1910, too, as China was in the throes of entering the modern era, with trains, electricity, telegraphs, and a new interest in democracy.