Line of Duty

A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life. AC-12 turn their spotlight on Lindsay Denton.

Following the tragedy at the hospital, AC12's Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit.

Lindsay is denied bail and finds herself targeted in prison. Growing increasingly desperate, she tells Kate her theory of why she is being framed.

Following her attack in prison, Lindsay is allowed to visit her dying mother. Meanwhile, Dryden shrugs off allegations about possible links to the ambush.

Lindsay fights for her life as troubling details emerge of a vicious conspiracy involving corrupt police officers. Meanwhile, Hastings is under pressure.

AC12's investigation exposes a criminal gang run within the police. Steve is convinced of Lindsay's innocence, but Kate still believes she had a role in the ambush.