DCI Billy McCartney Books in Order

The DCI Billy McCartney books are hard-edged crime novels built around drugs, informants, and the feeling that old cases never really stay buried. Billy McCartney works in and around Liverpool, often in the murky space between police work and the underworld. He is not a neat, puzzle-solving detective. He is stubborn, damaged, and usually driven as much by instinct and unfinished business as by procedure.

In The Killing Pool, Billy is pulled into a major investigation after a mutilated body turns up near Liverpool docks. The dead man is tied to the Rozaki family, a powerful crime clan at the centre of a long-running heroin operation, and the murder threatens to wreck years of surveillance work. Billy also needs to find a missing young woman who may be the one witness capable of holding the case together. The book moves through bars, back streets, docks, and police offices with a strong sense that everyone is under pressure and nobody is fully clean.

Liverpool matters here as much as any suspect does.

Sampson uses the city not just as backdrop but as engine. The books carry its dockland history, its migrant communities, its nightlife, and its uneasy relationship with police power. That gives the series a wider social texture than a standard detective story. Even when the plot turns violent, there is always the sense that these crimes grow out of real networks, old loyalties, and institutions that have been bent for years.

The House on the Hill opens the canvas out. A young woman arrives at Billy's door and pulls him back toward a failed undercover job from 1990, when he and DS Camilla Baker were sent to Ibiza to trace dangerous ecstasy moving through the tourist economy. From there the story jumps between past and present, and between Merseyside, Ibiza, and Morocco. The geography gets bigger, but the emotional centre stays the same. Billy is still chasing not just a criminal network, but the moment in his own past when things went badly wrong.

That is the thread linking the series. These are crime novels about consequences. Billy's cases are tied to guilt, obsession, and the cost of getting too close to dangerous people. Expect undercover work, corruption, gangland politics, and a lead detective who keeps pushing because he cannot quite let the past go. There is plenty of action, but the real pull is watching each new clue strip away another layer of his history.

Best read in order, the second book lands harder when you know what Billy has already lost.