Greg and Margaret are struggling to hold their relationship together on a remote South Pacific atoll, where Margaret studies a dwindling population of migratory birds while Greg remains uncertain about his own purpose. Their isolated routine is disrupted when Bo and Darce arrive after crashing their beloved Hula-Hoop into a nearby coral reef.

The unexpected arrival brings tensions and upheaval that threaten to transform the lives of all four characters, as personal relationships and the wider world around them begin to shift.