Nancy Springer 
Friendship Song [EPUB ebook] 

When Harper and her dad move to a new house, a creepy stepmom is the least of her worries Harper is not too happy to be moving in with her soon-to-be stepmother, Gus. The eccentric woman’s home, which the neighbors call the Spook House, has a yard full of weird metal sculptures. Gus is nothing like Harper’s dad’s other girlfriends, and Harper would take her former trailer home over the Spook House any day. Luckily, a girl named Rawnie lives right across the street. Harper and Rawnie have lots in common, including the same favorite band: Neon Shadow. When the girls start hearing mysterious rock music coming from Gus’s yard, they get suspicious. Then something terrible happens at a Neon Shadow concert, and Harper and Rawnie have no doubt that there are dark forces at work . . . and that Gus is involved. With their favorite singer in danger, they just might be the only two who can save him.