Who is Fiona Brewer from About a Boy and what is their importance?

Fiona Brewer is Marcus' mother. Fiona is clinically depressed. After moving from Cambridge to London and ending a relationship with her latest beau, Fiona finds herself unable to get out of bed in the morning. Fiona struggles with single parenthood, especially since she never truly wanted to be a mother in the first place. Fiona also struggles with her own self worth and the idea that she might be alone for the rest of her life. Fiona's emotional struggles lead to a suicide attempt that causes an emotional crisis in her son and a sense of instability that will take Marcus on a journey of self discovery with Will.