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...