Tells the story of two witnesses to a maritime disaster who commit to aiding the families of the victims, while a contemporary coxswain’s daughter grapples with her family's life-saving legacy. Following the 1886 shipwreck of the Mexico off Southport, which claimed the lives of rescue crews, the Macaras initiate a mission that revolutionizes charity fundraising. Shannon, a newly certified navigator, struggles to step out of the shadow of her renowned father, Eddie, as she seeks to prove her worth on their lifeboat. Despite the evolution of equipment over the centuries, the courage needed remains the same. When a yacht sends a mayday call, Shannon confronts the age-old question: How far will you go to save a stranger?