When Artie sees a ghostly figure in his family’s barn, he can't believe his eyes! Ghosts aren't real, are they? But the ghost girl explains she's not dead or a ghost—she's a time-traveller from the future! But she lost her tour group and can't find her way back home... and if she doesn’t get back to future soon, she could disappear! Can Artie and his sister, Cassie, find a way to help her?