Hazel receives a letter from her mother, announcing a visit in three weeks and prompting a promise of mutual letter writing.
Hazel and Flora count down the days to their mother's visit by marking a homemade calendar.
Despite some hardships at school as an evacuee, Hazel enjoys life in Binsey, including Bridie’s cooking, Harry’s sketches, and adventures with Kelty in the woods.
Kelty, who has a tough life with Mrs. Marchman, bonds with Hazel and Flora, and they build a fort together near the river.
Hazel writes letters to Mum, filling her in on their countryside experiences and drawing pictures, though feeling it's insufficient.
Flora panics and puts on a gas mask after mistaking a police siren for an air raid warning, revealing her deep-seated fears.
Hazel struggles with math, feels embarrassed in front of Harry, and refuses his help due to her developing feelings for him.
Flora and Hazel argue briefly over counting numbers, illustrating Hazel's frustration and concern for appearing foolish.
Hazel comforts Flora, who is quick to forgive, showing the close sisterly bond and Hazel's desire to be more grown-up.
Kelty sneaks to Hazel's window at night to inform her of her runaway plan, leaving Hazel worried but sworn to secrecy.
Hazel reveals to Bridie that she is unhappy at school and Bridie agrees to let her be schooled at home like Harry.
Hazel breaks her promise to Kelty by confessing Kelty's runaway plan to Bridie, who understands and vows to ensure her safety.
Hazel and Flora eagerly await their mother's arrival, coping with the unease of separation but hoping to keep their new life.
Mum arrives, bringing comfort and gifts, but displays signs of stress and change due to the war.
Despite Mum's altered demeanor after the war starts, the family enjoys a pleasant visit, and Hazel’s fears of war disrupting happiness are assuaged.
After Mum leaves, Hazel, although knowing Mum is upset, feels content with staying in Binsey and dreads a return to Bloomsbury.