4.4 – Anger Management

First broadcast 1/2 August, 2004.

Boyd attends anger management sessions whilst simultaneously, with the team, investigating a murder which is connected by the pistol used to many other killings stretching back decades.

Notable guest stars: Nigel Terry, TP McKenna.

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The one where… Boyd learns to quote The Tempest when he’s stressed… and then gets punched in the face.

 

4.5 – The Hardest Word

First broadcast 8/9 August, 2004.

Boyd’s team combine with another police unit to search for a serial killer who carves the word “sorry” into the backs of his victims.

Notable guest stars: Phil Daniels, Julian Glover, Emma Fielding, James Dreyfus.

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The one where… Grace quietly seethes when Boyd takes a shine to the other team’s (younger) offender profiler.

5.3 – Subterraneans

First broadcast 2/3 October, 2005.

The discovery of two bodies leads the team to a man whose entire life is built on deception and pretence.

Notable guest stars: Toby Stephens, Nicola Stephenson, Ronan Vibert.

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The one where… an inadequate man pretends to be something he’s not and hides out in an allotment shed. And nothing much else happens.

5.4 – Straw Dog

First broadcast 9/10 October, 2005.

Grace’s past comes back to haunt her when Tony Greene launches an appeal against his murder conviction – the one she helped secure in the early days of her forensic career.

Notable guest stars: Tom Ellis, Paul Freeman, Angela Bruce.

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The one where… the ’80s police investigation is shown in multiple flashbacks, significant details of Grace’s past are revealed including her affair with Harry Taylor, and the team receives a jar full of severed human fingers.

6.2 – Deus Ex Machina

First broadcast 14/15 January, 2007.

Trying to avoid a diplomatic incident, the Foreign Office task the CCU with finding the skull of the Mahdi, which was taken as a war trophy in the 19th century. In a parallel investigation, the team try to identify the murderer of Omar Jaffiri, who was allegedly tortured on behalf of the British security services.

Notable guest stars: Graham Crowden.

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The one where… everyone spends an awful lot of time looking at skulls.

 

6.6 – Yahrzeit

First broadcast 18/19 February, 2007.

Boyd is sent a dagger from New York, which relates to a case Mel was looking into just before she died. As they investigate a murder from the ’40s, the team are temporarily joined by Sarah, a Mossad agent who tracks Nazi war criminals.

Notable guest stars: Michelle Forbes, Eileen Atkins.

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The one where… the wartime plot is shown in black and white flashbacks, and Boyd gets romantically entangled with Sarah.