GR Halliday Books in Order

If you want the full Monica Kennedy arc: From the Shadows → Dark Waters → Under the Marsh
If you want the clearest entry point: From the Shadows
If you like grim serial-killer cases: From the Shadows → Dark Waters
If you prefer old secrets and cold-case tension: From the Shadows → Under the Marsh

G.R. Halliday was born in Edinburgh and grew up near Stirling, in a part of Scotland where history, weather, and landscape can make even an ordinary day feel a little charged. He has said that, as a child, he was fascinated by the unexplained mysteries his father investigated and wrote about. That left a mark. Before he could properly spell, he was already pecking at a typewriter and trying to make stories of his own.

The dark stuff arrived early.

Reading was part of the route in. Halliday has talked about loving Enid Blyton and Roald Dahl when he was young, then later finding a model in Robert Louis Stevenson, especially for pace, character, and setting. He has also pointed to Nordic noir writers as an influence, which makes sense once you see how much place, dread, and psychology matter in his books.

He wrote novels in his twenties, but for a long time he kept his work close. By his own account, he was shy about sharing it. The turning point came with From the Shadows, the manuscript that finally felt ready to leave the desk. He sent it to an agency, was taken on by the first one he approached, and soon had publishers interested in the book.

That mix of patience and sudden momentum shaped his debut. From the Shadows introduced DI Monica Kennedy, an Inverness detective investigating the murder of a teenage boy on the Highland coast while another young person is already missing. The novel was shortlisted for the McIlvanney Debut Prize in 2019, and it set the tone for Halliday's fiction: dark cases, strong atmosphere, and a real interest in what fear does to people.

That interest kept growing in Dark Waters and Under the Marsh. These books stay within crime fiction, but they also look closely at trauma, memory, guilt, and the private pressures that follow investigators home. Halliday has a background in history and psychotherapy, and that pairing feels useful. The history shows up in the sense of place and the weight of old stories. The psychotherapy shows up in the way his characters carry damage, hide things, and misread themselves as often as they misread each other.

Monica Kennedy is a big part of why readers stick around. She is determined, sharp, and often stretched thin, especially as a single mother trying to balance brutal work with ordinary life. Halliday does not write her as effortlessly in control. He lets the job cost something. That gives the series a bit more bite than a straightforward puzzle mystery, even when the plots are moving quickly.

He still lives close to the world he writes about.

Halliday now lives in the rural Highlands outside Inverness with his partner and a band of semi-feral cats. Alongside writing, he works as a psychotherapist, and when he is away from the desk he likes mountain climbing and swimming in the sea. His debut novel later became the basis for the television drama The Dark, which feels fitting for a writer whose work has always leaned toward lonely places, buried secrets, and the uneasy feeling that someone, somewhere, is watching.