Fault Lines

Crime comes closer to home in this finale when forensics worker Kelly Mahon is found brutally murdered in her flat. Ronnie and Sam get straight on the case, and after some investigating, they discover that she took a taxi home. Finding the taxi driver, they're immediately suspicious. However, it's only when an almost identical attack is attempted on Lucy Kennard - who worked with Kelly - that they become certain they have found their culprit. When the police arrive to arrest the taxi driver, he makes a run for it. In pursuit, Sam arrests cabbie Carl Lucas. As they question him, and ask why he ran, he reveals that he had stolen goods in his car. But is he telling the truth? Or have they caught their man? At first, Lucy's evidence seems compelling. But when it's revealed to the jury in court that her relationship with Sam Casey was more than it seemed at first, the whole case looks in jeopardy of being thrown out...

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Patrick McLennan is a London-based journalist and documentary maker who has worked as a writer, sub-editor, digital editor and TV producer in the UK and New Zealand. His CV includes spells as a news producer at the BBC and TVNZ, as well as web editor for Time Inc UK. He has produced TV news and entertainment features on personalities as diverse as Nick Cave, Tom Hardy, Clive James, Jodie Marsh and Kevin Bacon and he co-produced and directed The Ponds, which has screened in UK cinemas, BBC Four and is currently available on Netflix.

An entertainment writer with a diverse taste in TV and film, he lists Seinfeld, The Sopranos, The Chase, The Thick of It and Detectorists among his favourite shows, but steers well clear of most sci-fi.