The novel begins with the introduction of Mer, a slave and healer on a sugar plantation in St. Domingue. In the opening chapter, Mer and her helper/lover Tipingee deliver the stillborn child of a slave woman named Georgine. The three women later bury the body at the edge of a nearby river, and their songs and prayers deliver Lasirén into being. Lasirén subsequently appears to Mer to inform her that the salt roads are drying up, and tasks Mer with clearing them. This task underpins the majority of Mer's story - her struggles to both understand and undertake the work of clearing Lasirén's path to the minds of the Ginen drive the progression and development of the novel's plot during her lifetime. As the Haitian slaves around her begin to rally against the "backra" (white slave owners), called to violent revolution by the demagogue Makandal, Mer struggles for a more peaceful path to freedom. Her service to Lasirén puts Mer at odds with Makandal's method of obtaining freedom, and Mer's eventual possession by Lasirén at a key point in the story results in the failure of Makandal's revolution, the killing of Makandal, and the loss of Mer's tongue. Though she is later given the chance to escape her own enslavement, Mer chooses to stay with the slaves on the plantation. It is understood that Mer embodies one of Lasirén's aspects - her duty will be to heal the Ginen, and to fight for their freedom by preserving their heritage and thus keeping the salt roads clear for Lasirén.
