"It can start with a knock on the door one morning. It is the local Indian agent, or the parish priest, or, perhaps, a Mounted Police officer The officials have arrived and the children must go." So began the school experience of many Indigenous children in Canada for more than a hundred years, and so begins the history of residential schools prepared by the Truth and Reconciliation Commission of Canada (TRC). Between 2008 and 2015, the TRC provided opportunities for individuals, families, and communities to share their experiences of residential schools and released several reports based on 7,000 Survivor statements and 5 million documents from government, churches, and schools, as well as a solid grounding in secondary sources. A Knock on the Door, published in collaboration with the National Centre for Truth and Reconciliation (NCTR), gathers material from the TRC reports to present the essential history and legacy of residential schools and inform the journey to reconciliation that Canadians are now embarked upon. An afterword introduces the holdings and opportunities of the NCTR, home to the archive of recordings and documents collected by the TRC.