My sister the vampire

Did you ever once find a long lost twin sister? Well, Olivia once did when she was a new kid at school. And her twin sister is Ivy. But Ivy has a really grave secret. Ivy is a vampire! However, it doesn't matter for Olivia because Ivy is her sister. In her new school, there are a lot of vampires too who has not told her secret to any one..Together,they have four fasinsting adventures with wonderful discoveries. The first book 'switced' Is the first book when they discover that they are twins. I would say ages 11or up readers should read this because there are some pats young readers could be cunfused of. Rock on Ivy and Olivia!!