Bishop and Pike get dragged into their most dangerous case yet, one that will truly test their morals. Meanwhile, the Unit are under the watchful eye of the new `by-the-book' Deputy Director, Richard Cockridge.

Tension mounts as Pike and Bishop are drawn deeper into the Markides family. Tanner sweats over her recent decision to steal a sum of `drug' money to fix a problem in her personal life.

The hunt for a missing girl leads Bishop and Pike to Amsterdam and into the heart of the Markides's dark operations.

As Alex regains control of the family, Mikey puts Bishop and Pike in charge of a gun-trafficking op. But the boys quickly find themselves out of their depth.

Elena digs into Bishop's identity. Meanwhile, the boys hunt for a lead in Cyprus. But how long can they keep their cover?

Bishop and Pike's covers are blown, with serious consequences for the unit. With the boys' lives at stake, Tanner goes head-to-head with Elena.

Bishop seeks out one last chance to bring the Markides family down. But this time, Pike isn't prepared to help him.

The unit must go off-the-books if they're to take down Alex and Mikey. Adrenaline-fuelled series finale. Strong language from the start and violent scenes.