Sam & May - Shadow of Pursuit

The young girls Sam and May think they're only best friends. In fact, they are twins - vampire twins - and the one to tell them is the famous singer Nick Blackoak, apparently their uncle. But when Nick tells the girls that their biological parents disappeared in the wars of the kingdom fifteen years ago, they can't believe they're really dead. Together with their cousins, the girls and Nick set up on a journey to find Annalena and Leonard, the lost countess and count...

(not a fanfiction. all characters are fictional and similarities to living and dead people are accidental and not on purpose.)