D.S. John Rebus is drawn into a violent criminal conflict that turns personal when his brother Michael, a former soldier, crosses the line in order to provide for his family.

     Episode 1
A violent street attack is investigated by DS John Rebus and new detective Siobhan Clarke; however, it's John's family that pose unexpected problems, along with an awkward affair.

     Episode 2
Hard-up Michael Rebus' rash act in Fife has bloody consequences for his brother John; meanwhile, Siobhan finds out who stopped the street attack, and John confesses to contact with the criminal Cafferty.

     Episode 3
John's words come back to haunt him, while his brother abducts drug dealer Darryl Christie and recruits ex-army comrades for a risky raid; John hears his paralysed former partner's confession.

     Episode 4
John is frustrated at family gatherings, unaware that the Cafferty and Christie rivalry is viciously escalating, with Michael at its heart.

     Episode 5
Michael has motivation to kill Cafferty, as has John, while Darryl Christie tries retaliation, using Siobhan to help his plan.

     Episode 6
Lives are at stake, with John's loyalties torn and more revelations to come, while Rhona questions Chrissie, but home truths prove more dangerous.