Callan

I as addicted to this series when it was first shown. Seeing it again in recent years confirmed to me just how good it was. Far better than most modern fare.

Callan was a reluctant killer who somehow always ended up doing what he knew was right but also what was morally grubby. The other characters were all superb and strongly drawn in their own right. Hunter, the leader of the section, Lonely the criminal low life friend, Toby the upper class psychotic who ends up his friend. The only drawback is the lack of strong women characters, apart from a few occasional guests.

This was a spy drama that made you think, that made you question your own side.

Modern writers could well learn from this series.