H.O.W.L. High Goes Bats! is a novella written by Ellen Leroe. It was first published in 1993.
Description[]
Terror Town was every kid's scream come true.
Especially mine. For a kid who's half warlock and a horror movie fan, what could be more exciting than an amusement park based on scary movies? And the best attraction of all would be Castle Dracula, because my gang at H.O.W.L. High had designed it!
But we never expected the real Count Dracula to appear! He was convinced my friends and I had the ruby that gave him his powers. If he found it, we'd be his next victims. But if I got to it first, the ruby would turn me into a vampire! Either way, I seemed destined to end up a blood-sucking monster-unless my warlock powers could save me!