After the police raid their house, Lenny starts talking about protests and injustices against Pacific Islanders by the government, which inspires the whole family to become involved in the movement.

"When Aster wakes alone on a tropical island, she has no idea what has happened, why she is there, or where to find her younger sister, Poppy. Meanwhile Sam, who once met the sisters on a plane, makes links between the mystery of their disappearance and suspicious happenings in his own life. In a stunning dual narrative, the truth unravels with devastating effect - and the answer lies in the secret underwater world surrounding the desert island, populated...