Joan Aiken 
Black Hearts in Battersea [EPUB ebook] 

Wait, wait! Save us! What ll we do? Simon is determined to become a painter when he grows up so he sets off to London to make his fortune. But the city is plagued by wolves and mysterious disappearances. The Twite household, where Simon is lodging, seems particularly shifty. Before he even gets a chance to open his glistening new paints Simon stumbles right into the centre of a plot to kill the King. And worse than that Simon is kidnapped and sent to sea! Luckily there are two friendly stowaways aboard the feisty Dido Twite and the spoiled young Justin. But when the ship catches fire things look pretty dire. Can they escape? Will they save the king in time?BACKSTORY: Test your knowledge of Black Hearts in Battersea and play the name game.