Garrett Brink

Garrett Brink moves through the edges of the investigation in Belfast, a figure whose calm, procedural manner masks the pressure building underneath. He speaks carefully, keeps his own counsel, and seems to know more about how the city's institutions work than he lets on to the people around him.

Frank McCusker plays him with a dry, watchful restraint that suits the show's slow-burn tension — small hesitations and clipped answers doing the work of dialogue. It's a performance built on withholding, which keeps you studying him even when the scene seems to be about someone else.