We see a seal underwater, and then we see Ronan herself dancing — bathed in red light on a dance floor — and then falling down, blind drunk.
After this flashback, we learn Rona has come back home to her childhood home for an extended visit, after a decade in London, where addiction took hold and ruined her relationships — especially with thoughtful boyfriend Daynin (Paapa Essiedu), who achieved success as she disintegrated.
From nightlife in Hackney, London, to a sheep farm in Scotland, where the days of sobriety are ticked off for us — 30, 90, 117. The challenges here are different. Rona’s father, Andrew (Stephen Dillane), is loving but suffers bipolar episodes. Due to his debilitating illness he lives away from his wife, Annie (Saskia Reeves), who has turned to religion to cope — and that’s the only solution she can offer Rona.
Deeply lonely and always on the precipice of relapse, Rona sees a crack of light in the darkness when she takes on volunteer work with the Royal Society for the Protection of Birds, given the job of surveying the Orkney Islands for the disappearing corncrake. This bird needs help to survive, and soon it seems to represent Rona herself.
But Rona’s troubles follow her no matter how deep into the countryside she goes. As she tells fellow addicts in a devastating flashback from her alcohol recovery group, what she misses most is how good alcohol made her feel. At another point, she tells someone she’ll never be happy if she’s sober — and you believe her. In yet another harrowing scene, a relapse has her howling to her mother: “All that praying didn’t help me, Mum!”