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The Unquiet Grave : The new novel in the thrilling Irish detective series from the bestselling author of THE RUIN and WHAT HAPPENED TO NINA, for fans of Jane Harper and Robert Galbraith - Dervla McTiernan

The Unquiet Grave

The new novel in the thrilling Irish detective series from the bestselling author of THE RUIN and WHAT HAPPENED TO NINA, for fans of Jane Harper and Robert Galbraith

By: Dervla McTiernan

Paperback | 31 March 2026

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Every grave has a story ... The much-anticipated new novel in the Cormac Reilly series, from the no.1 bestselling author of The Ruin and What Happened to Nina.

For years the boglands of Northern Europe have given up bodies of the long-deceased. Bodies that are thousands of years old, uncannily preserved. Bodies with strange injuries that suggest ritual torture and human sacrifice.

When a corpse is found in a bog in Galway, Cormac Reilly assumes the find is historical. But closer examination reveals a more recent story. The dead man is Thaddeus Grey, a local secondary school principal who disappeared two years prior.

There's nothing in Grey's past that would explain why he was murdered, or why his body was mutilated in a ritual manner. At first, progress on the case is frustratingly slow and Cormac struggles to keep his mind on the job. His ex-girlfriend, Emma Sweeney, is in trouble, and she's reached out to him for help - Emma's new husband has gone missing in Paris, and the French police are refusing to open an investigation into his disappearance.

Cormac is sure that he has found Grey's killer, and is within hours of an arrest, when another mutilated body is discovered on the other side of the country. Two days later, a third body is found. Press attention is intense. Is there a serial killer at work in Ireland? Has Cormac been on the wrong trail? And if so, can he find the murderer before they strike again?

'McTiernan is a bestselling crime writer for good reason, and this is another brisk, moody police procedural with an effortless command of pace and suspense' Sydney Morning Herald

'Excellently tangled' Washington Post

Praise for the Cormac Reilly novels:

'Dervla McTiernan just gets better and better' Chris Hammer

'A haunting mystery that will have you turning pages late into the night. This is Gone Girl-level good writing.' Janet Evanovich

'Intelligent and fast-paced' Wall Street Journal

'Taut, dense and darkly addictive. A treat for lovers of fine crime writing.' Candice Fox

'As moving as it is fast-paced' Val McDermid

'Cormac Reilly [is] a cop to follow to hell and back' Bookseller+Publisher

About the Author

Number one internationally bestselling author Dervla McTiernan is the critically acclaimed and award-winning author of six novels, including the much-loved Cormac Reilly series and two number one bestselling standalone thrillers, The Murder Rule and What Happened to Nina?, both New York Times Best Thrillers of the Year and both currently in development for screen adaptation.

Dervla is also the author of four novellas, and her audio novella, The Sisters, was a four-week number one bestseller in the United States. Before turning her hand to writing, Dervla spent twelve years working as a lawyer in her home country of Ireland. Following the global financial crisis, she relocated to Western Australia where she now lives with her husband, two children and too many pets.

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