[1] After an eventful year in Kudat, he was transferred to Sandakan as Port Health Officer, then to Keningau as District Surgeon, Beaufort and the Interior.
Clarke recorded his experiences of capture, working as a doctor under the Japanese in Brunei and his eventual incarceration in Batu Lintang camp, an internment camp in Kuching, Sarawak under the pen-name Derwent Kell, in the book A Doctor's Borneo, In Peace and War published in 1984.
[1] He wrote under a pseudonym, because he said his "real name was pre-empted by a well-known professional writer", a reference to Australian author Marcus Clarke.
On Nevil Shute's trip to Australia, he offered to fly the local Cairns doctor, Clarke, on his rounds in Northern Queensland.
Based on accounts from his daughter, Bev Clarke, it is likely Marcus partly inspired the characters of Jean Paget and Joe Harman in his famous book A Town Like Alice.