Art historian Nora Barnes and her husband, Toby Sandler, are visiting West Ireland for a family reunion. During a morning walk through a deserted village on Achill Island, Nora stumbles upon a body—her notorious uncle Bert. When a clue singles out her mother as the likely suspect, Nora and Toby are on the case to clear her name. Whether in a barroom brawl or the sauna of a swingers' club, Toby has Nora's back. As they search, the dead of Achill seem to speak from graveyards, ruined churches, and megalithic tombs. A second murder makes it all the more difficult to connect the dots. And when Nora and Toby become the next targets, their own survival is at stake.