Welcome to the River Wye: a place of poetry, historic obsession - and occult murder. The curious death of an estate agent is being investigated by detective David Vaynor who, before joining the police, studied the famous 18th century poet William Wordsworth. As Vaynor is discovering, the dark paganism that changed Wordsworth's life still lingers on the banks of the River Wye today - and there are some killings even the police can't approach. Enter Merrily Watkins, parish priest, single mum, and diocesan exorcist for Hereford. Called away from her local hauntings, Merrily finds herself confronting the riverside ghosts who, as Wordsworth puts it, 'promote ill purposes and flatter foul desires'. In the ancient heart of the Wye Valley, a buried grudge is about to come to light.