Sir Robert Skinner's stock is rising - after retiring from the police service he's been promoted to head an international media organisation. Yet a series of unexplained deaths on his home turf in Scotland threaten to bring him crashing back down to earth.

As Skinner helps the elderly in his local community, several residents seem to die of natural causes. But when a gruesome discovery is made in a Glasgow flat and one of Skinner's long-time friends - an aspiring politician - emerges as the prime suspect, things become very murky indeed.

After unpicking clues that go nowhere, Skinner and his team are left grappling the most baffling conundrum they have ever encountered - is there a mystery at all?