The sole survivor of a murderous ambush, a Belfast police detective is forced into a desperate search for a mysterious informer that takes him to a holy island on Lough Derg, a place shrouded in strange mists and hazy rain, where nothing is as it first appears to be.

A keeper of secrets and a purveyor of lies, the detective finds himself surrounded by enemies disguised as pilgrims, and is drawn deeper into the mysteries of the purgatorial island, where he is forced to confront a series of disturbing secrets and ghosts in his own life.

Haunting and unsettling,Turncoat probes the legacy of the Troubles, the loss of collective memories and the moral consequences for the individual. It is a story of guilt, survival and the terrible price of self-knowledge, told through the voice of a detective with a double life. Descending into paranoia, he uncovers a sinister panorama of cover-ups and conspiracies. The closer he edges to the truth, the deeper he is drawn into the currents of power, violence and guilt engulfing his country...

"Turncoat is one of the most powerful and thought provoking novels on the Troubles and it's legacy I've read" - Crime Time

"Unexpected, thought-provoking, and unsettling, there is more to this book than initially meets the eye" - LoveReading

"Quinn provides a haunting and poetic exploration of what it means to seek refuge and find understanding of the self" - Crime Reads