Vampires and Pirates

I'm reading a book called Vampirates and I got to say I really enjoy the book. Its about a set of twins named Connor and grace there father dies and they never new there mother. When there father dies they go out to sea. They get into a bad storm that breaks there boat in half, they get separated from each other. Connor gets stuck on a pirate ship and Grace ends up on a vampirate ship! She meets the captain of the ship who tries to convince her that he does not want her blood and that she is a guest on the ship. She's allowed to go out of the cabin in the day but at night she is told to stay inside with the curtains shut! While Connor believes his sister is still alive everyone else on the ship says he just imagined the ship with the sail that look like wings, that he thought his sister was saved by. It's a really cool book you should read it!