The story of this movie is the book "Before Snow Falls" written by Leyla in "I Can't Think Straight".
When asked in an interview how she got into character for the two roles of Katya and Lauren, Rebecca Ferguson said that she would listen to music that she thought each character would have listened to. This helped her separate the two roles in her head but she would not disclose what music she used for either character.
The end credits song is "Now That You Love Me Again" by Ella Henderson which is currently, unfortunately unavailable to buy.