One of MI6's most respected officers, Fiona enjoyed constantly shifting identities and even the lies. This chameleon quality was deeply attractive to her husband Adam but unlike him, she shied away from introspective questioning, knowing her best work was her skill in the field.

She was intensely loyal both to her family and workmates but struggled with the conflict of motherhood and espionage. Though she loved her son Wes, she would never leave the world of the spooks willingly.

She had previously been married to Farook Sukkareih, a Syrian spy. This past life caused her ultimate downfall, when he shot and killed her while she was working undercover.