DCI Jo Davidson faces increasing pressure from all sides as AC-12 make major breakthroughs in the investigation, but an attempt to interview a key witness goes horribly wrong.

Cast: Nigel Boyle, Shalom Brune-Franklin, Martin Compston, Amy De Bhrún, Adrian Dunbar, Rosa Escoda, Perry Fitzpatrick, Kelly Macdonald, Vicky McClure, Andi Osho, Gregory Piper, Anneika Rose