Midnight is a Place by Joan Aiken
Lucas Bell is an orphan, sent to live at Midnight Court with his ill-tempered guardian. He longs for a friend - someone to have adventures with. But when Anna-Marie arrives from France, she's spoilt, wilful, and ungrateful for his friendsip. But one night Midnight Court burns down, and now Lucas and Anna-Marie are truly on their own. Forced on to the streets of Blastburn, they must fight to survive ...
A compelling tale of villainy and suspense from a best-selling author.