In September 2009 Christopher Hartley was shot at point-blank range at a layby in South Yorkshire - well known for public sex - in what appeared to be a drug deal that had gone wrong. The reality was much more complex involving love, betrayal, loyalty and greed.

We see how cell site analysis helped solve this case and examine in detail how committing murder affected the mind of the killer, including the rather odd way he expressed his introspection about events on social media.  Macbeth it isn't....