Line of Duty

DCI Jo Davidson receives new information about a suspect in the murder of investigative journalist Gail Vella. Suspicious of her motives, AC-12 launch an investigation.

AC-12 suspect a cover-up as an officer on DCI Davidson's team appears to have sabotaged the inquiry into Gail Vella's murder.

On the strength of evidence from a new witness, Jo brings Terry Boyle back in for questioning. Meanwhile, Kate is torn between loyalty to Jo and wanting to assist the investigation.

AC-12 make major breakthroughs, but an interview with a key witness goes horribly wrong.

AC-12 link Gail Vella’s murder with a historic case of police corruption, but forces beyond their control threaten to derail the investigation.

As AC-12 struggle to deal with the repercussions of tragic events, Hastings makes one final bid to uncover institutionalized corruption before his time runs out.

AC-12 close in on 'H', the Fourth Man (or Woman) orchestrating the network of corrupt officers.