Found

Sarah Robinson and her family are shipwrecked on a remote and mysterious island. Their food is scarce and there’s no sign of rescue. They have seen strange creatures, rescued a mysterious girl, and found the Curator, who has captured Sarah’s father and stepbrother to use in a bizarre time-travel experiment. And then the only man who knows about their island comes back-he’s looking for buried treasure, and won’t leave without it, even if it means leaving the Robinsons stranded.

Time is running out. They must get off the island.