Belonging tells the story of historian Catherine Corless, whose research into the Tuam Mother and Baby Home uncovered the absence of burial records for 796 children. Her investigation revealed evidence suggesting many were buried in a disused sewage tank on the former home's grounds. Despite significant opposition, her work exposed a major historical injustice, prompted international attention, influenced the Vatican, and contributed to the establishment of an Irish Commission of Investigation. Blending memoir with investigative history, the book also explores Catherine's personal family story and her determined campaign to restore dignity and justice to the children of Tuam.