I think the details of the Garvies' unusual lifestyle certainly helped to convince them. It also led to people queueing up at five in the morning outside the High Court in Aberdeen in winter to get in.

Max had been getting bored for some time. Described as a farmer, he was more of a manager with other people doing the work and him reaping substantial profits. First fast cars filled his time, then a private aeroplane. His new book suggests the police investigation ignored many clear signs of the abuse endured by Sheila which could have impacted her behaviour at the time of the murder. Read More I do think deep down she felt there was no other way out. He was either going to murder her or she had to do something else. I think as well she was trying to protect her children and felt she was doing the right thing. There is also an image of the secret tunnel where the farmer’s decomposing body was found, wrapped in an undersheet, three months after he disappeared. The culvert where Max Garvie was dumped after he was murdered by Sheila Garvie and Brian Tevendale in 1968.

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Mr Nicol raises a new theory suggesting that the finger was pointed at the wrong woman and it was one of Max Garvie's former flames - the sister of Brian Tevendale, Trudy - claiming she was the true architect of the murder in revenge of being dumped. As the murder trial went on, stories emerged of orgies at a rural hideaway called ''kinky cottage'' and of Max Garvie's insatiable desire for drugs, drink and sex. He even bought a property dubbed ‘Kinky Cottage’ in Alford, 20 miles west of Aberdeen, where he held nudist parties. And now half a century on, the police photographs from Maxwell Garvie’s murder files have been revealed as part of a true crime podcast investigation which has uncovered new insights into the murder.

TIM'S LEGACY OF PEACE; Wendy Parry tells ECHO Women's Editor SUSAN LEE of her son's lasting legacy On the 10thanniversary of the Warrington bomb Our... Yet sitting alongside her were Tevendale, 22, and his friend Alan Peters, 20, who was also accused of the killing and the disposal of Maxwell Garvie’s body in a disused tunnel, where he was buried after being shot to death. Sheila Garvie was called a femme fatale The Cairnbeg Farmhouse in Fordoun, Kincardineshire, was dubbed 'kinky cottage' (Image: Daily Record) Read More Related Articles It was later turned into the television series In Plain Sight, starring Martin Compston and Douglas Henshall, for which Mr Nicol was the script adviser.Sheila, more than either of her co-accused, stands as an enigma for the detectives working the case, as a wronged innocent for the lawyers hired to help her. She is branded by the media as a scandalous femme fatale, a murderous mastermind, a Lady Macbeth. During the trial, details emerged of Max’s appetite for swingers’ parties, which Sheila insisted he’d forced her to take part in.