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.

Life (and children) intervened and, for a few years, Marion's writing was put on hold. During this time, she worked as a college lecturer, plantswoman and candle-maker. But, as a keen reader of crime fiction, the lure of the genre was strong, and she began writing her debut crime novel. Now a full-time writer, Marion lives in North-east Fife, overlooking the River Tay. She can often be found working out plots for her novels while tussling with her jungle-like garden and walking her daughter's unruly but lovable dog.