It's Cora's birthday and she's fed up. It's been too quiet since she jailed The Graveyard Killer and she's itching for another mystery to solve, so Cora is thrilled when Becky hires her to investigate a case.Becky asks Cora to dig into a convicted killer's case. Darren Duggan's girlfriend, Stacey, think he's innocent and wants him released. At Bakerbury Prison, Cora interviews the thoroughly unlikeable Darren who, five years ago, was found guilty of murdering his ex-girlfriend Anita. He insists he didn't do it and points the finger at local weirdo, Roy Gleeson. Cora suspects Darren's telling the truth and her suspicions grow when prison boss, Governor Peacock, warns her off the investigation. Cora tracks down Gleeson at an up-market housing complex for ex-soldiers. Gleeson is a once-homeless army veteran, seen following Anita days before her murder; but he denies killing her.Cora finds herself in hot water with Hooper but, undeterred, discovers a dark conspiracy at the heart of picturesque Bakerbury...