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The stunning showdown between bullish DCI Roz Huntley and creepy whistle-blower Tim Ifield left things literally on a knife-edge (or should that be electric saw-edge?!), but with Roz failing to report for duty, what has happened?

Operation Trapdoor continues, as does AC-12’s investigation into how the case has been handled, and we’re treated to the first big super-tense interrogation of this series.

But when a dismembered body is found and another shocking discovery is made, both enquiries take fresh turns.

Elsewhere, Kate and Steve somehow find time to discuss their career ambitions with poor Hastings – surely he has enough on his plate without this, too?!