When Watson's holiday in the Lake District takes a sinister twist, he and Holmes must uncover the truth hidden by superstitious locals, folklore and rumours of prehistorical monsters far away from the familiar streets of London...

A serene walking holiday in the Lake District becomes a far more sinister excursion for Dr Watson when disappearances and murders start occurring in the small town of Wermeholt.

Local legends, rumours of large slithering reptiles and spooked palaeontologists have the denizens paranoid and terrified, so it is up to Watson and his inbound companion Sherlock Holmes to uncover the truth and discover what is really lurking in the lake...