When paranormal investigator and Cambridge lecturer Dr Nathaniel Gye is commissioned by a dead man to find his killer, he dismisses the incident as a clumsy fraud by a fake medium. But when Nathaniel's wife disappears - an eventuality also foretold by the 'unquiet spirit' - he is forced to look for connections between her predicament and the violent death of a man she never knew. Caught deep in a web of crime and deception, he has to face some difficult questions in this dark and fast-paced mystery thriller.