The Tuckers are forced back together when Macaulay is taken into care. Michael Stubbs is struggling with life as an officer and when an exercise goes wrong and the investigation by SIB brings Garvey into contact with his past.

The Tuckers receive help from Nancy to find the truth about Macaulay. Jo Farrell seeks Marsha Stubbs help to woo Collette but it starts to backfire when their partners become suspicious.

As the men return to the UK and go on leave, an face from Dave Tucker's past comes to visit. Paddy Garvey and Nancy Thorpe make some important decisions and Major Rory Taylor reflects on what might have been.

Brad Connor receives some bad news from back home. The men go on exercise against the Territorials and one reservist causes a lot of trouble for Jo Farrell and Steve Evans.

Paddy Garvey struggles to tell Dave Tucker his news until it's too late whilst Dave tries to woo back Donna. Complications during a live firing exercise results in a secret coming up to the surface.