To prevent the destruction of his planet, teenaged Rigg Sessamekesh, who can manipulate time, must assume more responsibility when he and others travel back 11,000 years to the arrival of human starships. Interest Level: YA ATOS Book Level: 5.7 AR Interest Level: MG AR Points: 21 AR Quiz: 154844EN Reading Counts Level: 6.2 Reading Counts Points: 30 Lexile Measure: 790 Lexile Code: HL (High-Low).