Book cover has a ship and a blonde boy

Ok so the book plot is a blonde boy with one ear is the son of a fisherman and the boy gets kidnapped by pirates one of them is nice to him. He gets bought by a rich Arabic man who has a short mean hunchbacked helper. The man dies in the end and the blonde boy gets some coins jewels and freedom. He also gets the short man who also used to sleep on the roof and had a pet cat. In the end, the boy and man went to the girl the boy liked and gave her gifts. What is this book name? It's driving me nuts.