Ravine — Janet Hickman

Jeremy's dog has slipped her leash and disappeared into the fog-filled ravine-to Jeremy's great frustration. His mother has made it very clear that the ravine is both dangerous and off-limits. Jeremy's best friend, Quinn, wants to play their favorite game, Warriors, in the ravine. Should Jeremy obey his mother? Follow Quinn? Track his beloved dog? ...

Ulf stands transfixed as the dog emerges from the fog. No one in the land owns such a beautiful animal. Ulf does not allow himself to think that this creature might belong to him, for slaves are permitted nothing. It is only because the Wizard made space for Ulf in his hut in the ravine that the boy has a place to sleep. But with the coming of the dog, Ulf's life begins to change....

The dog, Duchess, has opened a slip in time -- a slip through which two boys and two completely different worlds are destined to collide.