What is the main conflict in The Piano Tuner by Daniel Mason?

Edgar Drake, a piano tuner living in Victorian London, is commissioned by the army to travel to Burma to fix the piano of Surgeon-Major Carroll. Edgar sets off on the long journey and encounters many different cultures on the way. Eventually he reaches Mae Lwin in Burma and fixes the piano. He plays music for a local Prince, which helps to convince the Prince to sign a peace treaty. Meanwhile, Edgar develops feelings for a beautiful Burmese woman called Khin Myo. Just as he is coming to love Burma, however, Mae Lwin is attacked and he is forced to leave. He is picked up by the British, who accuse him and Carroll of being traitors. He learns that just three days after the peace treaty, the Shan Princes attacked British forces. Edgar manages to escape and tries to run back to Mae Lwin, but he is shot.