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 by the
beautiful and the impossible ...