The discovery of an unconscious smuggler below the sea wall of the quiet Northern fishing town of Whitby ignites a terrifying chain of events. Detective Louise Bloom has no choice but to enlist the help of Cockburn, a marine biologist who’s there to research the local mollusc population, when they find that the common mussel appears to be growing from underneath the comatose criminals skin. Waking up in a panic and escaping his hospitalisation, the now grotesquely disfigured smuggler disappears into the small town.
The savvy detective and the ‘fish out of water’ researcher quickly discover that these parasites have latched onto his bones and are sucking him dry until they pop fully grown through his flesh… ready to infect the next unwitting victim. With the infection spreading quickly, Lou and Cockburn must act quickly to stop any more of the population becoming victims… including themselves.