In 1920s Ireland young doctor Damien O'Donovan prepares to depart for a new job in a London hospital. As he says his goodbyes at a friend's farm, British Black and Tans arrive, and a young man is killed. Damien joins his brother Teddy in the Irish Republican Army, but political events are soon set in motion that tear the brothers apart.
While Sandra opens up to a documentary film crew, flashbacks show her teenage son, Stephen, mysteriously kidnapping a toddler, and holding him captive. Eventually, the stories intersect to explain the abduction and the family's three-generation legacy of abuse in this mesmerizing psychological drama.
