Chased by a secret order, thirteen-year-old Wade Kaplan (plus step-brother, cousin, and cousin’s best friend) traverses the globe searching for parts of an age-old astrolabe that doubles as a time machine—although in the first book (The Forbidden Stone), an actual spanning of time is limited. There is a second book (The Serpent’s Curse) and a collection of novellas (The Copernicus Archives).
After their arrival at a local hospital, the students, aged 7 to 14, and teachers on the bus claimed that it entered the south side of the Somosierra Tunnel and was immediately struck by. . .

Variants

(1)
  1. The Copernicus Legacy by Tony Abbott (9 September 2014).
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Tony Abbott