Their parents, Chester and Serena Wolcott, had children for the most selfish of reasons. When the twins weren't what they expected, Chester assigned them stifling gender roles. One of them he dresses as a tomboy, Jill, while the other, Jacqueline, he dresses in finery.
Unsurprisingly, what their father does has disastrous effects. When they reach the Moors, they reverse roles; Jack becomes self-sufficient and skilled in the sciences while Jill becomes the vain daughter of a vampire.
This is the 2nd part of the Wayward children series. Though it lacks the spark of the first part, it offers a wonderful depiction of the Moors.
