Draco is drawn into Death-Eaters' activities more directly in "Harry Potter and the Half-Blood Prince". Because of Lucius' arrest and fall from Voldemort's favour, Narcissa Malfoy and Bellatrix Lestrange visit Snape at his home to discuss a dangerous task that Voldemort has assigned Draco. Narcissa, deeply worried that her son will be killed in his attempt to complete it, begs Snape to make an Unbreakable Vow to aid Draco with this task and protect him at all costs, and if Draco fails to complete the mission, he will complete it himself; he agrees.