Unconventional detective Jeff Slade becomes even more unconventional when nerd Holly Turner reveals the limited time machine left to her by her lost-in-time father.
If something has happened, it will happen.

Variants

(1)
  1. Crime Traveller by Anthony Horowitz (1 March 1997).
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Anthony Horowitz