I read this book recently. It is about a medical missionary doctor, Ken Moynagh. Patrica St John has written the biography and so you can be assured that it is written engagingly.
So much to learn from God’s dealings with this man. The issue of being broken before God was one big lesson for me. Also the need for ongoing dependence on the Holy Spirit.
There is a helpful appendix on depression as well.
I wholeheartedly recommend this as a worthwhile read