The gang at TG World Books can always be counted on for fun, transformation based stories, but Secrets at Echowood College may very well be their 'biggest' tale to date. DK Masters has crafted a great tale that equal parts Buffy and X-Files, with a little gender-bending to bring it all together.
This is unique for another reason, in that the gender-bending is neither the focus of the story, nor the target of the protagonist. This is a story of good versus evil, or magical orbs, and time travelling heroes. Yes, there are transformations of students and faculty aplenty, but not of the gender variety.
There's a lot going on, but Secrets at Echowood College is paced extremely well, making for a quick, fun read.