Following a devastating bomb attack outside the North British Council Building at Holyrood in Edinburgh, police superintendent Coira Keir finds herself fleeing from her employers and MI5, the intelligence service of the United Kingdom, up the west coast of the territory of North Britain towards the front line of an intensifying war.
But it's not just her pursuers she must beware of. The wild coastline has become a hiding place for desperate boat-borne refugees. Meanwhile, someone unknown seems to be going to extraordinary and ever more lethal lengths to stop her pursuers finding her.
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