UCOS reopen the thirty year old murder of porn king Jim Hockney when his daughter Sara reveals that a DNA test proves she is not his daughter. Her mother Jane cannot provide any answers as she and Jim both had several sex partners. Jim's girlfriend at the time, singer Angela Gold, was charged but acquitted of the murder and now seems to have disappeared. Brian's replacement Dan Griffin arrives, albeit late and is initially treated with hostility by Gerry, who thinks he is a spy. Nonetheless Dan tracks down Angela though in the meantime Sandra learns that Jim's brother Colin sold Jim's porn empire very shortly after his death to his main rival Gavin Reason. Furthermore Jane and Gavin were lovers, Gavin proving to be Sara's father though he was unaware at the time. However it is Gerry's collection of some of Jim's old films, supposedly confiscated by Vice Squad, that identifies the murder weapon and leads to the culprit. The case closed the team watch Angela perform at Ronnie Scott's Jazz Club.

Recién llegada de su exitoso asalto SWAT a un grupo de gángsters rusos, la DCI Sasha Miller llega a UCOS para reemplazar a Sandra. Es amigable e informal, pero inicialmente no logra conquistar a Gerry, quien extraña a Sandra. Su primer caso involucra el asesinato de veinticinco años de Allesandro Manzini, un italiano, reabierto cuando se encuentra un cuchillo en la parcela que solía cuidar. Massimo, cuyo hijo se casó con la hija de Allesandro, Giulietta, le cuenta al equipo que había sentimientos anti-italianos en la parcela, especialmente por parte de dos veteranos de la Segunda Guerra Mundial, mientras que el conductor de camión y druida Ray Barlow también es sospechoso, ya que desapareció después del asesinato. Esta sospecha aumenta cuando Giulietta y Ray admiten tener una aventura, pero la investigación de Dan sobre la Italia de la guerra cambia todo, llevando a una confesión. Sin embargo, la vida privada de Sasha no va tan bien.

When the recently deceased pathologist Dr Hatton's findings are discredited the team looks into the 2005 drowning in his bath of cricketer AJ Da Silva, a suicide according to Hatton though AJ's father and brother are convinced he was murdered. Ted learns from coach Keith Ainsworth and former captain Ryan Reed that AJ was thoroughly disliked by the other cricketers in his side as an arrogant, drunken womaniser. In fact his affair with a team mate's wife was held responsible for the man's suicide. After another person is found dead the key to AJ's demise is found to be match-fixing and its consequences and, the case solved, Ted springs a surprise on his colleagues.

En 2011, el investigador privado Dave Hooper fue asesinado en su oficina, supuestamente víctima de un robo fallido, pero ahora ha salido a la luz su cuaderno secreto, escrito en taquigrafía, aunque su ex novia Carmen Cresswell no pudo descifrarlo. Alison Downing contrató a Dave para perseguir a su novio ladrón Jason Sharp, al igual que Barry Warnock, víctima de cáncer, después del robo de un sello raro conocido como el Primo Ruso y valorado en £40,000. En consecuencia, el progreso del sello es clave para identificar al asesino de Dave.