From NetFlix:

Director Sharon Maguire’s powerful drama stars Michelle Williams as an adulterous young housewife struggling to come to terms with the deaths of her husband and infant son after they’re killed in a terrorist bombing at a London soccer game. Crippled by grief, the widow seeks comfort through affairs with two men (Ewan McGregor and Matthew Macfadyen), inadvertently putting herself in the midst of a dangerous love triangle

Michelle Williams is the center and most of this film. Tangentially her orbit is touched by her husband, by Ewan McGregor, by Matthew Macfadyen, by the son of a terrorist, and most of all by her little boy. Here is an imperfect young woman victimized by an imperfect world inhabited by terrorists. Her story, her reactions, and her final “solution” are a creative set of imagined circumstances that are more or less plausible.

Toward the end of the film her non-acceptance fantasies continued, for me, a bit too long. Don’t expect a perfect ending.