Between the devil and the deep blue sea ? Viking treasure is discovered beneath the icy waters of the North Sea and local historian Doctor Anna Taylor is called in to help catalogue the most exciting hoard in living memory. But when a shipwreck diver washes up dead, she?s soon out of her depth. Luckily, she knows just the person to call ? When DCI Ryan arrives at the picturesque fishing town of Seahouses, he's faced with an impenetrable wall of secrets...