Serving Life, the autobiography of Gore woman Margaret Currie, will be launched at a function on Saturday.
The book is edited by Auckland author Hugh Kemp.
Mrs Currie said she started writing the book while she was taking part in Christian work in the prisons of Mongolia in 2012.
“I got a real urge to write in Mongolia – I just had to write down some things I didn’t want to forget,” Mrs Currie said.
Even though she was very busy and was tired at the end of the day, she spent her evenings writing instead of watching television or visiting people.
“I didn’t go to bed till midnight.
“I did that for a whole month and got the book on the computer.”
The 85-year-old spent time serving the Overseas Missionary Fellowship in Malaysia before spending more than 20 years in Mongolia.
Earlier this year she added more chapters to the book to tell the story of other parts of her life.
The book contained some amusing stories.
“I can remember all the funny things that have happened.”
The book launch for Margaret Currie’s Serving Life, will be held at the St Andrews Presbyterian Church Hall from 2pm to 4pm, Saturday.