The crashing of waves, the somber recrimination of chilly charcoal clouds: for the young woman at the center of this story, Rona—played, in a marvelously nuanced performance by Saoirse Ronan —these are both markers of time and reminders that sometimes it’s necessary to temporarily drop out of time,

The Oscar-nominated actor outdoes herself in this sometimes tortuous tale of an alcoholic learning how to live with sobriety