Kathi, Info on Rev. Frank Harmon is very limited & confusing.  
Suzanne Beere says on April 10, 2015:
My grandparents, Frank Henry Brigg Harmon and Marjorie Porteous Harmon were interned at Chapei Camp also. My great grandfather Frank Harmon was a missionary in China from 1882. He served the Chinese Labour Corps in WW1 when he was 62 years old. He was also present at the relief of Peking. I would love to see photos of China at this time.
B is for … Bubbling Well Road, Shanghai 上海南京西路老照片 | Visualising China  (Web page)
Ancestry lists 3 Fathers: Dennis John McCarthy, Frederick Frank Harmon & Asa Erwin Harmon. Frank Harmon was also known as: Frederick Dennis McCarthy while studying at the Guinness Missionary Institute. Went to China with the Baptist Missionary Society.