What to read after Kidnapped?

When young David Balfour's father dies and leaves him in poverty, he tracks down his Uncle Ebenezer to seek his inheritance. But his uncle is a mean, nasty man with a dark family secret. David finds himself in terrible danger when he is kidnapped and taken prisoner on board a ship bound for slavery - he must escape. With the help of daring rebel Alan Breck, David faces a wild adventure as he is hunted across the desolate Scottish moors. Robert Louis Stevenson's action adventure novel is brilliantly introduced by Alexander McCall Smith.