The glowing stone seem to throb with unknown power. What are they, and why are they here in this hidden cavern? All sixteen-year old Jeanette Lacy and her young brother Neil know is that the stones are calling to them… and they can’t resist.

Their first steps on this mysterious pathway take them whirling through time to Texas-one hundred and thirty years in the past. But it is a strange past, a Texas where two moons hang in the sky and where unicorns are all too real. With the help of a boy named Jesse the Lacys try to find their way home, but the stones lead them to a terrifying future where the worst crime of all is to travel in time…