Detective Inspector Deakin joined Sun Hill's CID when he was thrown out of the Flying Squad and forced to suffer the indignity of being disciplined by demotion because of his affair with a senior officer's wife. The rumours were rife on his joining the station but this sandy-haired harmless looking chap didn't look as if he posed a threat to anyone. It soon became clear however that Deakin sought to resurrect his career at Sun Hill, but he found his path blocked by Sally Johnson. Never keen on women superiors, Deakin succeeded in undermining her and quickly stepped into her shoes when she left.