Until their mother vanished, the Greystone kids knew nothing about the other world. Everything is different there. It’s a mirror image, except things are wrong. Evil. Their mother tried to fix it, but she and an ally got trapped there along with Ms. Morales, their friend Natalie’s mom. Now the four kids - brave Chess, smart Emma, kind Finn, and savvy Natalie - are determined to rescue everyone. To do so, they have to go back: into the other world, where even telling the truth can be illegal.