Olivia Abbott is a vegetarian. Ivy Vega is a vampire. Somehow, they’re twins. At least, that’s how they’re depicted in the second book of Sienna Mercer’s “My Sister the Vampire” series. However, Mackenzie Giberson wouldn’t know much beyond those basic details.

“I read the first few pages and couldn’t get into it,” said the McKinley Avenue Elementary School third-grader, who on June 8 stopped by Stafford Intermediate to deposit Fangtastic!