Eleven-year-old twins Felix and Moira Valdez expected a boring summer at the crumbling property their great-uncle left behind. They did not expect the observatory on the hill ? or the doors inside it that open onto other times.
Desmond Valdez spent his life building something in that canyon, and he left it unfinished. Now the doors are open, the rules that keep them stable are written in a notebook nobody finished reading, and every crossing the twins make pulls the whole structure a little further out of true. Paris. San Francisco. A city by a bay that shouldn't exist yet. Each trip is a wonder. Each trip is a crack.
When the doors begin to collapse, Felix and Moira have to finish their great-uncle's last and hardest work ? building an anchor strong enough to hold a hundred years of open doorways steady ? or lose the way home for good.
The first book in The Horizon Reach Chronicles: a time-travel adventure about two kids, one impossible inheritance, and the difference between an ending and a door left standing.
