A remote island off the North Devon coast, Devil's Rock is home to few inhabitants. The rugged coastline has a history of smuggling and shipwreck, but there has never been a murder - until now.When the body of Kieran Deveney is found on Devil's Rock, two islanders confess to the killing. Both claim they acted alone, and neither can be convicted while the other stands by their story.The team is relying on CSI Ally Dymond to uncover the evidence that cracks the case.

What she finds is a community awash with secrets.Shortly after she arrives, the island is hit by a storm that prevents anyone from leaving. But it's not the treacherous weather that Ally fears, it's the people she's trapped with...