In case you haven't figured it out yet, I don't own Harry Potter.
Lucius' mission
"Ah, Lucius!"
"You sent for me, my lord?"
"Yes, I have a something for you to do." I waited for him to continue. "As you are aware, I'm sure, everyone claims they are unaware of the whereabouts of Harry Potter. But I am sure of one person that would for sure know."
"Forgive me if I am mistaken, but doesn't he have a younger sister at Hogwarts right now?"
"Yes, indeed he does. You Lucius will see that she tells you where Potter is."
"And what if she does not give into the torture?"
"Use your imagination" he said with a dark, ghostly chuckle.