The Boudica series

Alongside her original contemporary thrillers, she has written two sets of four historical thrillers. The Boudica series were her first historical novels, of which Dreaming the Eagle was the first. Rooted in the pre-Roman world of ancient Britain and the Britannia it became the novels 'give us back our own history',^[6] exploring the worlds of druids (called dreamers in the book and portrayed as shamans), warriors and the Roman occupation that, in Scott's eyes, destroyed a once-great civilisation.^[7] The books centre around two primary characters: the girl Breaca, who grows into the woman who takes the title 'Boudica' (meaning 'She who Brings Victory'^[8]) and her brother Bán, who, for much of the four books, is her nemesis.

Rome

Scott's Rome series (written under the ungendered name MC Scott),^[9] and beginning with The Emperor's Spy (2010), are spy thrillers, set in the same fictional universe with some of the surviving characters from The Boudica series. The first novel in the series follows the life of Sebastos Pantera, the spy whose name means 'Leopard', as he comes in from the cold of a mission in Britannia to spy for the Emperor Nero at the time of the Great Fire of Rome. In subsequent books, Pantera faces his nemesis, Saulos (aka Paul of Tarsus) in The Coming of the King, dives deep into the loss of a legion's eagle in The Eagle of the Twelfth, (the Twelfth Legion, apparently, did in fact lose their eagle, while the Ninth Legion, subjects of Rosemary Sutcliffe's Eagle of the Ninth, didn't) and returns to Rome for the Year of the Four Emperors in The Art of War.

Later

Between the two major historical series, she wrote The Crystal Skull, a dual timeline novel entered around a mythic Mayan skull, with a historical thread set in the Tudor era and a contemporary thriller set in modern-day Cambridge.

She began her dual time line novels with a fast-paced, "swift and vigorous" thriller, Into the Fire,^[10] which explores the truth behind the myth of Jeanne d'Arc – and the impact those revelations could have on modern day France.

A Treachery of Spies, winner of the 2019 McIlvanney Prize,^[11] is another dual time line, this one explores the impacts of actions by the Maquis, the SOE, the Jedburghs, and in particular, the nascent CIA on the present. It was announced in May 2020^[12] that veteran Harry Potter producer David Barron, and Enriched Media Group have secured all TV, film and ancillary rights to A Treachery of Spies and a TV adaptation was planned.

In 2010, she founded the Historical Writers' Association,^[13] of which she remained Chair until 2015.

Kellen Stewart

• Hen's Teeth (1997)
• Night Mares (1998)
• Stronger Than Death (1999)

The Boudica Series

• Dreaming the Eagle (2003)
• Dreaming the Bull (2004)^[16]
• Dreaming the Hound (2005)
• Dreaming the Serpent Spear (2006)^[19]

Rome

• The Emperor's Spy (2010)
• The Coming of the King (June 2011)^[20]
• The Eagle of the Twelfth (May 2012)
• The Art of War (March 2013)

Inès Picaut

• Into the Fire (2015)
• A Treachery of Spies (2018)

Stand-alone novels

• No Good Deed (2001)
• The Crystal Skull (2007)

Non-fiction

• 2012: Everything You Need to Know about the Apocalypse

Appearance in anthologies

• 99%: In Fresh Blood 3 (1999), edited by Mike Ripley & Maxim Jakubowski
• New English Library Book of Internet Stories (2000)
• Scottish Girls About Town: And Sixteen Other Scottish Women Authors (2003)
• Little Black Dress: An Anthology of Short Stories, edited by Susie Maguire