This research attempts to quantify the number of unaccompanied asylum-seeking children and children who may be trafficked in the UK care system, as well as the number who go missing from care. Heading back to harm reveals that, from September 2014 to September 2015, 28% of trafficked children (167 children) in care and 13% of unaccompanied children (593 children) in care went missing at least once. Of these, 207 missing trafficked or unaccompanied children had not been found. This research has identified a worrying lack of consistency in the way in which local authorities identify and record risk of trafficking and exploitation.  Topics covered include the links between child trafficking and unaccompanied children going missing and recommendations for how professionals should respond.