If you’re drawn to Saoirse Ronan’s versatility, this film is likely to appeal to you; her portrayal of "Rona" is remarkably committed. The story finds her returning to her mother’s home in Orkney as she attempts to overcome a difficult period involving alcohol and substance abuse experienced in London. The narrative interweaves different time periods, gradually revealing the factors contributing to her present situation while simultaneously depicting her attempts at sobriety. Naturally, there are also family difficulties—her father's bi-polar disorder and her mother’s embrace of religion—which amplify the challenges she faces. Eventually, she secures a position with the RSPB on an isolated island, tasked with locating the increasingly scarce corn crake. As inclement weather surrounds her small cottage and she resolutely pursues recovery amidst family tensions, she encounters considerable obstacles. Will she persevere or is another setback unavoidable? Ronan delivers a compelling performance, and Andrew Dillane is also quite good as her father—particularly once the film gains momentum and the characters are more fully realized. The cinematography, capturing both the beauty and harshness of the setting, effectively contributes to the pervasive feeling of confinement throughout the story. Her voluntary separation from others contrasts with what seems like a naturally outgoing personality. While it doesn't attempt any groundbreaking approaches to depicting addiction recovery or its associated hardships, it offers a character-driven drama that must have required significant expense in hair dye and avoids simplistic resolutions.

Source on TMDB