In the autumn of 1960, Father Thomas Riley and Father John Thornton were sent by the Vatican to investigate a miraculous event in an Irish home for 'fallen women', only to uncover something much more horrific.
A Londoner returns to his ancestral homeland of Donegal in the west of Ireland and is drawn in by a teenage boy who almost kills him in a car crash.
Follows rookie police officers working in Belfast, a city in which being a frontline response cop comes with unique pressures and dangers.
