Fight Fire with Fire — Francine Pascal

this scorching miniseries.
Jessica Wakefield cannot believe that her big brother, Steven, has fallen for her best friend, Lila Fowler. It's disgusting! Even Jessica's twin sister, Elizabeth, thinks Steven is making a big mistake. So the twins devise a perfect plan to snuff out the sparks between Steven and Lila. But when their scheme backfires, it could lead to a fiery death for someone they love!
Lila's been told not to leave town until the arsonist who burned her home has been caught--because she's still the main suspect. Then Steven discovers the real firebug...who holds a grudge against Lila and all the students at SVH. Worst of all, the arsonist is preparing to strike again...