<p>Charlotte Lockwood and Angus Darrow, private investigators based in Exeter, Devon, are approached by a convicted murderer who insists that he's innocent. </p><p>The case is a cold one, and all evidence points towards his guilt.</p><p><br></p><p>With their investigative skills put to the test, Lockwood and Darrow must delve deep into the past to uncover new leads and evidence. </p><p>But the more they dig, the more confusing the case becomes.</p><p><br></p><p>As they unravel the mystery, they begin to question whether the convicted murderer is telling the truth or simply trying to manipulate them. </p><p>Can they uncover the truth behind the cold case before it's too late?</p>