A man's pilgrimage becomes something from his darkest nightmares when secrets arise and ghosts haunt his path.

A woman has vanished on the Camino de Santiago, the ancient five-hundred-mile pilgrimage that crosses northern Spain. Daniel, an Irish expat, walks the lonely trail carrying his wife, Petra's, ashes, along with the damning secret of how she really died.

When he teams up to walk with vibrant California girl Ginny, she seems like the perfect antidote for his grieving heart. But a nightmare figure begins to stalk them, and Daniel's mind starts to unravel from the horror of things he cannot explain.

Unexpected twists and turns echo the path of the ancient trail they walk upon. The lines begin to blur between reality and madness, between truth and the lies we tell ourselves.

'By turns atmospheric, pulse-pounding, and achingly lyrical, Petra's Ghost is that rare, exceptional thriller that's sure to leave you haunted long after the final page.' - Andy Davidson

'The kind of rare, immersive read where you feel like you're breathing the characters' air and walking in step with them. Part page-turning mystery, part exploration of pain, loss and guilt, part highly original ghost story - the novel defies categorisation and is all the better for it. Atmospheric, brilliantly and engagingly written, I didn't want the journey to end (although what an ending it is...).' - Sarah Lotz

'Petra's Ghost follows a spiritual journey along Spain's ancient Camino de Santiago, or simply 'the Way'. Vividly realised, eerie, compelling and unputdownable, the novel is haunted at every step - I absolutely loved it.' - Alison Littlewood

'While every story will take you on a journey, it is a rare one that takes you on a pilgrimage. Petra's Ghost does that: it is a marvellous tale of love, death, and human spirit.' - Francesco Dimitri

'Chilling and mysterious, yet pure and sweet, Petra's Ghost soars from the very first page and accomplishes unforgettable heights. The characters, the imagery, the prose... everything shines. A beautiful journey. A mesmerising novel.' - Rio Youers

'Petra's Ghost is compelling and haunting, the psychological narrative propelled by the physical journey, as twisty as the path itself, with a vivid and visceral grittiness: you can smell the dust and feel the heat of the pilgrim trail.' - James Brogden

'In prose as clean as bone O'Cinneide tells an unsettlingly elegant tale. By turns horrifying and beautiful, this is a very fine ghost story indeed.' - Angela Slatter