Angel, born Olivia, was abandoned as a baby and adopted by the loving Rose and Billy. As a district nurse, she befriends an elderly couple, Jenny and Brod, who tragically take their own lives. In the aftermath, Angel uncovers a letter from Jenny hinting at her birth mother's identity. With the help of her adoptive parents and her biological father, Frank, Angel delves into her past, learning about her mother Moira's struggles with depression and the circumstances that led to her being left in the care of social services.
Through newfound love with the widowed Lawrence and his son Ralph, Angel builds a family of her own while uncovering more about her origins. She finds solace in Moira's diary, gaining insight into her birth mother's inner turmoil. As Angel's family grows, she reflects on the love and support she has received from both her adoptive and biological families. Though her journey has been marked by tragedy and unanswered questions, Angel finds peace in cherishing the memories of those she has lost and embracing the love that surrounds her.