Mary Prince recounts her life as a slave born in Bermuda, tracing her journey through a succession of increasingly brutal masters. Initially, she experiences a brief period of relative peace under her first mistress, Mrs. Williams, but the death of her mistress shatters this fragile security. Mary is sold away from her mother and siblings to a harsh master, Captain I, where she is subjected to relentless floggings, excessive labor, and horrifying cruelty. She describes the grueling conditions of domestic servitude and the devastating separation from her family, an anguish shared by countless other enslaved people across the islands.
Later, she is sent to Turk's Island to work in the salt ponds, an environment she describes as a living hell. Here, the labor is punishingly severe, requiring slaves to stand in brine for hours under a scorching sun until their skin blisters and their legs become riddled with painful boils. The cruelty of her master, Mr. D, is cold and methodical, punctuated by frequent whippings and total disregard for human suffering. Witnessing the deaths of fellow slaves like Hetty and the constant torment of others leaves deep emotional scars, yet Mary endures with a resilient spirit sustained by her inner faith and the hope of eventual freedom.
Years later, she returns to Bermuda and eventually secures a chance to accompany her master to Antigua, where she hopes for a better life. In Antigua, she marries Daniel James, a free black man and fellow Moravian, but her master reacts with fury, punishing her for daring to claim her own life. When the family travels to England, Mary seizes the opportunity to escape her bondage, knowing that slavery is illegal on English soil. Despite facing poverty, illness, and the persistent threat of destitution, she finds refuge with the Anti-Slavery Society and the Moravian church, ultimately committing her story to paper to awaken the conscience of the British public.