Books like Twin Spell

Twin girls are drawn to an antique doll, and find themselves sucked into a mystery from the past. It's spooky, but not terrifying; just the right chill-factor for the intended age group. The book is a little slow-moving by today's standards. Still, the story is interesting, and the characters well drawn. Plus, I love stories about twins. I read it thinking it was a time-travel story, but although the twins do slip into the past, it happens only briefly. It's more of a ghost story. (Retitled and better known now as Double Spell).