Located off the coast of Indonesia, the Australian territory of Christmas Island is inhabited by migratory crabs travelling in their millions from the jungle towards the ocean, in a movement that has been provoked by the full moon for hundreds of thousands of years. Poh Lin Lee is a "trauma therapist" who lives with her family in this seemingly idyllic paradise. Every day, she talks with the asylum seekers held indefinitely in a high-security detention centre hidden in the island's core, attempting to support them in a situation that is as unbearable as its outcome is uncertain. As Poh Lin and her family explore the island's beautiful yet threatening landscape, the local islanders carry out their "hungry ghost" rituals for the spirits of those who died on the island without a burial. They make offerings to appease the lost souls who are said to be wandering the jungles at night looking for home. In the intimacy of her therapy sessions, as Poh Lin listens to the growing sense of.