Natural Causes

Sixty years ago a young girl was brutally murdered - her internal organs removed and her body mutilated. Until now she lay undiscovered, sealed in an underground chamber.

For the Edinburgh police force the six-decade-old case is not a priority, but Detective Inspector McLean is haunted by the dead girl's ritualistic murder and the six trinkets placed carefully around the body.

As a wave of high-profile and bloody murders hits the city of Edinburgh - each one bearing any uncanny resemblance to the last - the same name begins to reoccur. As McLean digs deeper he must question just how many coincidences there can be, realising that the most irrational answer might be the only one possible...