Midnight Is a Place - Joan Aiken - Bog

Now, back in print, the engaging and suspenseful British fantasy by one of England's most imaginative storytellers.
Lucas Bell is lonely and miserable at Midnight Court, a vast, brooding house owned by his intolerable guardian, Sir Randolph Grimsby. When a mysterious carriage brings a visitor to the house, Lucas hopes he's found a friend at last. But the newcomer, Anna Marie, is unfriendly and spoiled-and French. Just when Lucas thinks things can't get any worse, disastrous circumstances force him and Anna Marie, parentless and penniless, into the dark and unfriendly streets of Blastburn.