The Fury (The Vampire Diaries, #3) by L.J. Smith

Elena, believing she was helping her boyfriend, Stefan, is tricked by his brother Damon into exchanging blood with him - little realising that this will transform her into a vampire too. Now crazed with her own wild craving for blood, it is up to Stefan to save her - but first he must find a way to end his feud with Damon...

About the Author
L. J. Smith is the author of more than twenty books for young adults, including the bestselling Vampire Diaries and Night World series. She lives in Northern California, in a rambling house in a small town. Lisa knew that she wanted to be a writer since she was about six, when a teacher praised a poem she'd written. She wrote her first book in high school, finishing it in her first year of college. Then she became a special education teacher before she became a writer full-time.