Vampirates: Demons of the Ocean by Justin Somper (kid's book)

Thanks to my friend Trisha for recommending this terrific book to me. The characters are well-rounded, the plot interesting, and I think this book could be really popular with tween boys and girls alike. Newly orphaned twins Grace and Connor must contend with pirates and with "vampirates" in this page-turner. I recommend it highly - and have already downloaded both sequels to my Kindle!