Detective Grace Macallan

When a covert police operation in Northern Ireland goes badly wrong, Grace Macallan is reassigned to the newly formed Lothian & Borders Major Crime Team and forced to rebuild her career and her reputation. But when a brutal attack on a prostitute turns into a series of murders, the Major Crime Team is under pressure. The tabloid headlines are lurid, and the team badly needs a result. With a new life to build in a new city, a new boss as smooth as an 18-year-old malt and a high-profile lawyer as the chief suspect, Grace begins to wonder if telling the truth is always the right thing to do.

Scarred by the troubles in Belfast, Billy Nelson returns to his loyalist roots following his discharge from army service. But an outbreak of gang violence forces Billy to move on to Edinburgh, where he muscles in on the capital's drug trade. As the balance of power tips, underworld rivalries between Edinburgh, Glasgow and Belfast spill onto the streets. With a spate of horrific incidents and a trail of victims, the pressure is mounting for Grace Macallan, new superintendent of the Crime & Counter Terrorism Directorate.

Grace Macallan is at breaking point, and a new investigation is testing her to the limit. An undercover officer is missing and a woman is washed up, traumatised and barely alive, on the shores of Berwickshire. As she untangles the woman's story, Grace is drawn into a cold-blooded criminal world headed by Pete Handyside, a notorious gangland boss who will fight hard and dirty to control his empire. But a traitor in his midst is intent upon betrayal, triggering an uncontrollable wave of violence. As she hones in on crucial evidence, Grace knows that one wrong move could end in tragedy.

A nine-to-five job away from the frontline isn't all it's cracked up to be for Grace Macallan. So when she's sent to investigate a suicide at Glasgow's notorious Barlinnie prison, Grace gladly escapes her desk. The dead inmate is Tommy McMartin, heir to a ferocious criminal family - though his murder conviction for killing his gay lover saw him cast out. The investigation drags Grace into contact with old McMartin adversaries - but the dynasty is under threat, and as it topples, buried secrets are unearthed.

At Police Scotland HQ, Grace Macallan has pitched up in Counter Corruption. But the demons of her past are never far behind. Meanwhile, Edinburgh's gangland is in turmoil, with territory battles causing serious havoc. Into the war steps DI Janet Hadden. An ambitious risk-taker, she knows how to throw opponents off balance. When she's thwarted, Hadden seeks help from a notorious underworld fixer - only for Grace to start an investigation that threatens to uncover all Hadden's secrets.

The arrest of a Finnish contract killer and the subsequent murder of an Edinburgh reporter seem unconnected—until a ghost from the past appears in the investigation. The horrors of past misdeeds in Northern Ireland, contract killers, military secrets and organised-crime feuds collide on the streets of Edinburgh and the Irish Republic, drawing Detective Grace Macallan into brutal score-settling on Dublin's streets and a life-or-death race against time.