The book is: Where three roads meet, by Sally Vickers. I had a look, couldn't find it, but the title just popped into my mind.
I once bought a copy for a friend to help pass the time on a flight to America. She e-mailed me when she arrived saying it had certainly done its job. She fell asleep reading it. Despite that, I think it a good interesting read.
http://www.salleyvickers.com/pages/books/where_three_roads_meet.htm
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