The Midnight Gate — Helen Stringer

It's been two months since Belladonna Johnson discovered she was the Spellbinder, and she's full of questions about her powers. When a ghost finds Belladonna and her classmate, Steve, and gives them a mysterious map, the friends don't know if they should be looking for or hiding from the one person who holds the answers to Belladonna's powers: the Queen of the Abyss. Throw into the mix that Belladonna's parents, who are ghosts, have disappeared and that her brand-new and maybe even sinister foster family seems to know more than they'll let on, and you have a sequel made of high adventure and intrigue, seasoned with affecting characters and topped with a dollop of wit.