Welcome to the River Wye: a place of poetry, historic obsession - and occult murder. Nestled deep in the Black Mountains, the village of Longtown is haunted by the double suicide of a lottery winner and his wife. A rich Londoner, unaware of the town's dark history, buys the dead man's cottage in the hopes of refurbishing it - then begins to fall victim to a host of bad luck. Luckily DS David Vaynor and Merrily Watkins - parish priest, single mum and renowned demon exorcist - are on the case.