In the high stone tower of an isolated naval fortress, Alice and Edgar approach their 25th wedding anniversary, haunted by shadows of resentment and bitterness. When Alice’s cousin Kurt comes to visit, the delicate balance of their dreary cohabitation falls off its axis, cracks growing into canyons. In Conor McPherson’s riff on August Strindberg’s master class in marital warfare, a timeless love triangle waltzes to the surreal rhythm of madness, plunging us all into the deep.