Here are some details from the BBC Press Office:
Martin Shaw returns as old-school detective Inspector George Gently in the crime drama set in the Sixties, written by Peter Flannery.Some background information on the filming (now in England and not Ireland) can be found on the BBC Press Office website
It's 1966, and when a young woman is found murdered in an idyllic coastal village in Northumberland, Gently and Bacchus find themselves investigating a family with unimaginable secrets.
Initially it appears that the woman's estranged husband, Alan Charlton, father of their enigmatic young daughter Agnes, is responsible for the killing. Then they meet the child's uncle, Darren Paige.
With a rogue reporter, Max Osgood, desperate to get an exclusive story on the family, the police have their work cut out.
As Gently and Bacchus investigate the disturbed family, they discover an alarming truth.
In an added complication, Bacchus is having marriage problems and becomes jealous of Gently when he realises how close the older man has become to his wife, Lisa, and toddler Leigh-Ann.
Incidentally, is Bacchus the most irritating policeman on tv?