When Markus and Ariana travel to Markus' grandparents' home in rural Zone 77 of Sector 2 during a school break, they find things are very different from Sector 5 where they live. Zone 77 is like stepping back in time. Markus' grandfather gives the two children an old game without knowing the secrets it contains. A note is hiding within, and it hints at a mystery bigger than anything Markus and Ariana could have ever imagined. Unbeknown to them, danger and adventure await as they unravel secrets long forgotten. Will the mystery be solved? Will the secrets be revealed? In the end, their lives will be forever altered as they embark upon an experience unlike any other.