It all began when the Greystone kids -- Chess, Emma, and Finn -- learned about the other world. Everything is different there. It’s a mirror image, except things are wrong. Evil. Their mother tried to make things better, but she got stuck there along with Ms. Morales, their friend Natalie’s mom. But the four of them -- brave Chess, smart Emma, kind Finn, and clever Natalie -- won’t give up until they rescue their mothers. To do so, they will have to go back: into the other world, a place where truth is illegal. Going back into that world is scary, and Chess doesn’t feel so brave. Despite all her brains, Emma can’t seem to break the code. With everything spiraling out of control, Finn has to pretend he's okay. And Natalie is beginning to doubt whether her cleverness is something that’s good about her -- especially when she spends all her time lying to the people she loves.