A native of Dundee, Marion studied music with the Open University and worked for many years as a piano teacher and jobbing accompanist. A spell as a hotel lounge pianist provided rich fodder for her writing and she began experimenting with a variety of genres. Early success saw her winning first prize in the Family Circle Magazine short story for children national competition and she followed this up by writing short stories and articles for her local newspaper.
Now a full-time writer, Marion lives in North-east Fife, overlooking the River Tay. Her debut crime novel, the first in the DI Clare Mackay series, was published by Canelo in October 2019.