Back In TIme - Present To Past

Can the past really be so complicated?
In the year 2552, eighteen-year-old Mya Hanns and her twin brother Nico uncover a strange plot to disrupt Earth's history and change the past and present. They get caught up in a TimeShift which whisks them back to the year 2052, exactly five hundred years and three days in the past.
In the year 2052, Hana and Miles Carter, twins, find a bewildered teenager wondering in a woods who claims to gave no memory of what happened.
Together the three teens must foil Commander Diablo's terrible plot and rescue Mya before her body mass is used by Diablo to fix the TimeShift machine and stop him from leaving Mya and Nico in the past.