Thirteen-year-old Ava lives in Darwin with her family and their homing pigeons, of which Essie is Ava’s favourite. A Japanese family live next door and their son, Kazuo, is Ava’s best and only real friend. Her father is serving overseas.

While Essie is taking her first flight, Ava overhears an argument between her mother, and her brother Fred, who has lied about his age to join the militia. After the bombing of Pearl Harbor, he trains in Darwin and later helps set up a pigeon service in Townsville. When most civilians are sent to safety down south, Ava remains in Darwin because her mother (who works in the post office) is essential to the war effort.

Later that day, military police take Kazuo and his family away in a truck to a holding camp—much to Ava’s distress—along with many other Japanese people who call Australia home.

On February 19, 1942, Darwin is bombed, and Ava and her mother are evacuated in a cattle train with the remaining women and children. After a very difficult journey, they arrive, exhausted, at her grandparent’s home in Lake Boga, where they discover the extent of the damage to Darwin is being concealed from the population. Even those who were actually there know only part of the truth.

Desperate to do something to contribute to the war effort, Ava’s mother joins the WAAAF and begins work at the secret Catalina Flying Boat Base.

In the meantime, the authorities decide to transfer Kazuo to the men’s camp, separating him from his parents and siblings.

Living by rules and rituals has always been how Ava has felt safe, but when Kazuo escapes, she is faced with the hardest decision of all—whether to report a ‘potentially dangerous’ escapee to the authorities, or to protect a beloved friend …