Niamh and Shay are partying on the beach when a hooded figure rugby-tackles a lad to the ground. The figure reveals himself as Niamh and Shay's dad, Inspector Finn O'Hare; he saw the lad trying to sell drugs to the kids.
When an ATM machine is stolen, new detective Al crosses a line to save someone he loves. Meanwhile, Finn struggles to cope - and has a difficult conversation with Siobhan.
Feathers are ruffled when Port Devine's champion pigeons are stolen. And, as Finn falls to pieces, a frustrated Siobhan turns her attentions elsewhere.
An investigation into a drug-spiking pushes Finn over the edge - and he ends up injuring one of his own officers. Meanwhile Callum discovers Siobhan and Al's secret.
A fishing trip ends in disaster when the boat's engine blows up - who's to blame? Callum sees Al breaking the law - and tells Finn that Al is a corrupt cop.
As the police officers investigate a daring robbery at the local whiskey distillery, Al is exposed as a liar and thief - and Concepta drops a massive bombshell.
