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 and lies. As he juggles marine archaeology and the cutthroat world of shipwreck diving, another murder blows the case wide open.

To uncover the truth, Ryan must delve deeper into the hearts of those around him to find what lies beneath...