The threat from above casts a dark shadow A man falls to his death from a cliff face in western Scotland From a distance another man watches He approaches the body tucks a book into the dead man's pocket & leaves When the Scottish police show visiting Detective Chief Inspector Domenic Jejeune the book he recognizes it as a call for help But he also knows that answering that call could destroy the life he & his girlfriend Lindy have built for themselves in the village of Saltmarsh in north Norfolk Back in Saltmarsh the brutal murder of a researcher involved in a local climate change project has everyone looking at the man's controversial studies as a motive But Sergeant Danny Maik heading the investigation in Jejeune's absence believes a huge cash incentive being offered for the research may play a crucial role With their beleaguered Chief Superintendent blocking every attempt to interview the project's uber-wealthy owners Jejeune & Maik must work together to find their answers But will the men's partnership survive when the danger from above begins to cast its dark shadow?